Jump to content
SAU Community

Recommended Posts

Hi all,

Been back at the dyno a few times in last months.

Story is.. My FJ20 makes 500hp on the Pits dyno but its making loads of air temp. 70 deg after a 4th gear run. Went from a 450 cooler core to 600mm and made very little difference. Made about 520hp at 24psi but we pulled it back for safety. Its making over 10hp per PSI so turbo isn't showing it's maxxed.

Air temp issue needs to be solved so it's either try a plazmaman core or update the turbo with the theory being the 20yr old GT3040 is making heat.

Open to suggestions here but thinking an update to a Garrett G35/900 but not sure if this is going to make it lazy or new age turbo might even improve response.

Want to eventually see 550 to 600hp

So.. turbo or cooler? If turbo.. is the 35/900 in the ballpark?

Link to comment
https://www.sau.com.au/forums/topic/483172-fj20-turbo-choice-over-500whp/
Share on other sites

Good on you still pushing a FJ20 hard :)

A 20 year newer turbo is way better, either same power with more response or more power with the same response. They are also more efficient and will produce less heat at higher boost than olden day turbos

Thanks mate!

This is my thought, while it still makes good numbers with the old turbo, I'm sure that 20yrs of tech would see an improvement!

Just slightly concerned about the heat thing. But as many people use chinese intercoolers and make good numbers, I'm feeling like a big part of the problem is turbo. 

I would be very keen to see any 4 cyl engine running a 35/900 to see where it comes on and makes power etc.

.... whats your intake/engine bay look like?

E85 (in dyno situations) does reduce IAT's on repeated pulls. Most people like to run it if you aren't already. I saw a back to back jump after literally dyno tuning on E85 then putting 98 in the tank and running the car.

(I didn't get to 70C IAT mind you, and this was with a return flow blitz SE intercooler)

I mean... what air exactly do you think your pod filter is sucking in?

You will see changes if you move it a little out and box it in, and duct it/heatshield it. I have been doing science on it as of late and you should too (as above :p)

going from a HKS cooler to a plasmaman i went from an average of high 40/low 50 degree IAT to low 30 IAT.

 

This is all after several laps around a circuit.

I also found less fluctuation the HKS cooler would spike harder quicker where as the plasmaman takes longer from the IAT to increase.

  • Like 2
On 1/7/2022 at 8:05 AM, Gareth87 said:

Thanks mate!

This is my thought, while it still makes good numbers with the old turbo, I'm sure that 20yrs of tech would see an improvement!

Just slightly concerned about the heat thing. But as many people use chinese intercoolers and make good numbers, I'm feeling like a big part of the problem is turbo. 

I would be very keen to see any 4 cyl engine running a 35/900 to see where it comes on and makes power etc.

A local workshop is about to put a g35 900 on an ej25 and I know he will put results up @Plattsy has shared his results of  G30 on ej25. I think it made over 410kw at the wheels on e85. 

On 07/01/2022 at 11:55 AM, Kinkstaah said:

I mean... what air exactly do you think your pod filter is sucking in?

You will see changes if you move it a little out and box it in, and duct it/heatshield it. I have been doing science on it as of late and you should too (as above :p)

I understand that engine bay air is going to be hot, which is why my next avenue will be to build an external airbox and also add a Sensor pre intercooler to find out exactly where the temp is coming from before spending thousands.

 

On 07/01/2022 at 2:07 PM, hattori hanzo said:

going from a HKS cooler to a plasmaman i went from an average of high 40/low 50 degree IAT to low 30 IAT.

 

This is all after several laps around a circuit.

I also found less fluctuation the HKS cooler would spike harder quicker where as the plasmaman takes longer from the IAT to increase.

This is very interesting, heaps of people have said that cooler temps are drastically cooler with a plazmaman core, so it may be something to visit once I find out what the sensor says.

Knocking 20 degrees off is huge!

On 07/01/2022 at 5:51 PM, robbo_rb180 said:

A local workshop is about to put a g35 900 on an ej25 and I know he will put results up @Plattsy has shared his results of  G30 on ej25. I think it made over 410kw at the wheels on e85. 

Keen to see how that goes!

 

Surely there must be a few 4 cyl guys running a G35-900 around...

Bluebirds always had issues with hot engine bays , the std L20B needed an elec fuel pump to circulate enough to stop fuel boiling issues .

They don't appear to have good airflow through the engine bay meaning down past the transmission and out underneath .

The FJ20ET takes up a lot more space than the L Series and this doesn't help .

On 07/01/2022 at 11:03 PM, discopotato03 said:

Bluebirds always had issues with hot engine bays , the std L20B needed an elec fuel pump to circulate enough to stop fuel boiling issues .

They don't appear to have good airflow through the engine bay meaning down past the transmission and out underneath .

The FJ20ET takes up a lot more space than the L Series and this doesn't help .

Interesting you say that, I have noticed hot spots in the engine bay over the years. I have done a lot with heat shielding which seems to have made a difference. Saying that, engine temp has never been an issue though luckily.

I'll get the basics addressed asap and see what effect it has.

New turbo is pretty tempting though haha. sucks having mates with fast cars egging things on!

Many years ago I had an FJ in a Ser 1 TRX .

Was a major operation to reconstruct the rad support panel . I used an R32 GTR radiator with DR30 fans and an early Plazma intercooler . Arthur Jackson did the fab work inc the cut and welded bonnet to take a 1600 dog cock style bonnet lock .

Turbo wise a GT3040R or as some say GT3082R is definitely old school . The HKS version worked better than the Garrett marketed one , the difference was the 50 trim compressor in the HKS compared to the 56 trim one in the Garrett marketed version . 

 

  • Like 1
  • 2 weeks later...

So I have been doing some research into the turbo sizing and it's looking like the G35/900 is going to be a good fit for the engine combo.

It's also got a T3 housing so I can leave my manifold as is and just change to V band exhaust.

The biggest issue I've got is that going with that turbo seems to be best guess. I haven't had anyone overlay a compressor map yet or have many results to speak of. 

My main concern is increasing lag and loosing response. I don't suppose anyone has the compressor maps and is able to give me a ballpark pro/con over the rev range and will it be a significant improvement to power and usable power?

Current turbo - Garrett GT3040 - 0.82AR

Proposed turbo - Garrett G35/900 - 0.83AR

Engine limiter at 8300rpm - Current max boost 24psi

You could go the g30 900 and then you’ll have the same size exhaust wheel as your current turbo and a smaller front wheel then your current turbo and still have the ability to make a lot more power 

  • Like 1

A few people have suggested the g30/900.. i was concerned with it being not a big enough step forward. I don't know a great deal regarding compressor maps but I don't suppose you would have an overlay of the maps between the 2 turbos and how they would stack up? 

It depends if your current turbine is a restriction or not, if it is go up to the 35, it’s it’s not then stick the 30. Also the g30 turbine wheel will flow more then your gt30 one
either way you go the compressor wheel is going walk away from your current turbo 

Interesting. The 30/900 looks right on paper but weather it gives me enough headroom is the question.

I dont have a pressure sensor in the exhaust manifold so I won't know if I have a restriction unfortunately.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • PayPal is a safe, online payment system that enables businesses and individuals to safely send and receive money, making it an indispensable tool in both personal and professional contexts. However, many users wonder how to send money on PayPal? Don't be alarmed if PayPal is new to you - all the steps can be found by visiting merchant sites with links marked "Pay or send money". Once clicked, select payment method, amount, and add message or note for recipient(s). Upon successful transaction completion you will receive an email containing details of transaction. Let’s start by understanding how PayPal works, how money transfers from banks to PayPal and using various payment methods. Moreover, to transfer money between PayPal and bank, head to the Wallet section and click "Add Account", selecting either "Transfer within seconds with debit" or "Transfer between 3-5 days with bank", and following any instructions shown on screen until completed successfully.   How to Send Money Over PayPal: The Basics Before sending money through PayPal, first create an account. Here is how to set-up a PayPal account: ·         Click “Sign Up” on either the PayPal website or app to enter your basic information such as email address or name into their system. ·         Link your bank account, debit card or credit card directly with PayPal so you can fund transactions directly using these accounts. ·         Verifying your PayPal account will enable you to send and receive more funds. Typically, PayPal requires that you verify your credit card or bank account by making small deposits into it. ·         Once your PayPal account has been established, you can send money through it.   How Do I Send Money to Someone on PayPal? After creating a PayPal account, you can easily send money through it. Here is how to send money to someone on PayPal: ·         First of all log into your PayPal account ·         Once on your dashboard, click on "Send & Request Tab." ·         After this enter the recipient's email or mobile phone number. ·         Enter the amount you wish to send to someone. ·         At last, recheck all the details and click "Send Payment" to complete your transaction if everything looks in order.   How Can I Send Money PayPal for Goods and Services? PayPal provides a safe method for individuals and businesses alike to transfer funds online, both personally and commercially. When paying for goods or services there are additional protections in place both for buyers and sellers. PayPal Buyer Protection offers you peace of mind when paying for products or services with PayPal. In the unlikely event that there is an issue with a transaction, if there are any discrepancies you may dispute it and be eligible for a possible refund. You need to follow the same steps to send money, but select Paying for Services or Goods when prompted. In fact, this extra layer of protection will keep your account safe from fraudulent attacks.   How to Transfer Money to PayPal from Bank? Here is how to transfer money from PayPal from bank: ·         Log into PayPal using either its app or website. ·         Click "Add Funds" in the Wallet section, and add money directly from your bank to your PayPal account. ·         If you have linked your bank account with PayPal, select it under Funding options to select it as your funding option. ·         Enter the amount you would like to transfer to PayPal from your bank balance. ·         Click Add Funds. It typically takes several days for funds to arrive on your PayPal account.   FAQ How can I send money PayPal? Log into your PayPal account, select "Send and Request," enter in your recipient's phone number or email address, select the amount due, payment method of choice and click on "Send Now" - quickly and safely sending money via PayPal is now an efficient method of money transfers!   How do I transfer money to PayPal from a bank? Log into PayPal and select "Add Funds" to transfer money from your bank to PayPal. Select your account number, input an amount, and confirm it. Though the transfer may take up to several days for completion.   How do you send money to someone on PayPal? Simply log into your PayPal account, select "Send and Request", enter the recipient's phone number or email address, select the amount to send, and click "Send Now".   How can I receive payment through PayPal? Senders can easily accept payments with PayPal by providing your PayPal email address and being notified via email when a payment has been completed. When funds appear in your PayPal account, they will appear instantly!
    • At least yours have parkour down pat. One of mine will still trip over his own shadow and fall over... He's a special type of cat... Ha ha ha
    • The question then becomes - was there any fluid coming from that hole before you did the rebuild ?    You may not have noticed, of course.   Depending on how you did the rebuild, the possibility has to be considered that somehow (cleaning ?)  fluid entered that hole and is now being 'forced'  out by small movements of the proportioning valve.   From the factory, there's actually a small rubber plug in that hole but with age and under-bonnet heat it's quite common for it to 'go missing'.  That rubber plug is designed to allow the venting process but also to prevent 'stuff' getting to the area (prevent corrosion, etc).   The plug is also not available as a spare part AFAIA. Personally I wouldn't race and buy a new master just yet but keep an eye on the area to see if the 'leak' continues.   If you're concerned about brake fluid damaging nearby paintwork, cable tie a piece of suitable absorbant material over the hole and remove/monitor occasionally.    Operation of the proportioning valve and the brake master itself won't be affected, but also keep an eye on brake fluid level, of course. In terms of a new master, the genuine part is getting expensive, unfortunately.  Amayama is showing AUD900+.   I was searching recently and there's an aftermarket part available from Japan made by 'Parts Assist': https://zenmarket.jp/en/yahoo.aspx?q=BNR32%2bBM50&p=1 Whether it's any good I have no idea, although in my experience Japanese aftermarket stuff is pretty good quality-wise.   The above site allows overseas buyers to purchase stuff more easily from Japan but there are fees and shipping costs, of course.   The original Japanese seller page is here: https://auctions.yahoo.co.jp/jp/auction/p1197401228 Copper/Nickel is fine but I still prefer bundy tube and it's also cheaper.
    • Your chihuahuas look weird!
×
×
  • Create New...