Jump to content
SAU Community

Recommended Posts

hey peeps, im hopefully about to be the proud new owner of R30_turbo's car.

for a refresh its a '84 Paul Newman L20et

anways, im wondering what simple things can i do/change to make it more responsive?

ive notcied that the stock AFM is highly SMALL and restrictive. what can i do about this? will a Z32 AFM simply bolt on? like one of the 80mm ones or something like that?

  • Replies 2k
  • Created
  • Last Reply

Top Posters In This Topic

more free flowing exhaust is a great start, 3" all the way....with the afm swap you might find that there would be other things involved that would = $$$ a new programable ECU to work with the afm, stick to the basics as they work

1000 posts woops....

As capacity increases height increases as i think they keep the same/similar bores just longer stroke. although i can't confim for L20A's cos ive never looked at one.

IE if you mix and match a LD28 (diesel) crank to a L28 block with something like L26 rods and KA24 Pistons you come out with a L31

i have a program for 6 cylinder L series engines at home which calcs comp ratios etc from mixing diferent parts etc

As a matter of interest! does anyone know the differences of L series 6 cylinder engines?

Is their hieghts the same or does it increase as the capacity increases?

How far can the L20 be stretched etc, etc.

more free flowing exhaust is a great start, 3" all the way....with the afm swap you might find that there would be other things involved that would = $$$ a new programable ECU to work with the afm, stick to the basics as they work

1000 posts woops....

Only befitting that you posted it, as you did start this MARATHON originally.

But back to info, 3 inch would be to big I think, the exhaust guys roughly work on 1 inch per litre + 50% for turbo, so if it's mandrel bent, 2.5 would be plenty, but if press bent 2.75 would be the go, as the restriction in the bends is the resultant flow rate. My Paul Newman exhaust is a press bent 2.5 and it flows easy.

As for flow meters, I would look at Series 1 R31's, as the air box arrangement is very nearly identical, I know it's not turbo, but it is a 3L engine, or source an L28ET from Japan.

And further to my previous post, can you get 2800 from the L20 block by stroking with 280Z crank & rods.

Cheers, :ghost:

As a matter of interest! does anyone know the differences of L series 6 cylinder engines?

Is their hieghts the same or does it increase as the capacity increases?

How far can the L20 be stretched etc, etc.

are you talking full rebuilt to increase the capacity, some of the n/a z car L28 engines run 3L+ capacitys, its the block your talking about is'ant it? looking back phat mr30 answered quicker...

As capacity increases height increases as i think they keep the same/similar bores just longer stroke. although i can't confim for L20A's cos ive never looked at one.

IE if you mix and match a LD28 (diesel) crank to a L28 block with something like L26 rods and KA24 Pistons you come out with a L31

i have a program for 6 cylinder L series engines at home which calcs comp ratios etc from mixing diferent parts etc

Next question:

Is there size/capacity casting marks on the block?

If I wanted to make my PNV a sleeper looking all stock & standard, could I get an L28 block & change the engine numbers to L20 and get away with it, or has it L28 on the side.

Next question:

Is there size/capacity casting marks on the block?

If I wanted to make my PNV a sleeper looking all stock & standard, could I get an L28 block & change the engine numbers to L20 and get away with it, or has it L28 on the side.

stamped into the block i'm affraid..not the eazyist thing to find though..

As for flow meters, I would look at Series 1 R31's, as the air box arrangement is very nearly identical, I know it's not turbo, but it is a 3L engine, or source an L28ET from Japan.

Cheers, :ghost:

yeah the car already has a 3inch mandrel system all the way thru fromt he turbo.

so if i were to get an AFM from an R31 it will theoretically just plug in and bolt on, crank engine and free-flowing fun?

yeah the car already has a 3inch mandrel system all the way thru fromt he turbo.

so if i were to get an AFM from an R31 it will theoretically just plug in and bolt on, crank engine and free-flowing fun?

If it has the STOCK T25 turbo on it, source yourself a T25 from an FJ20DET. To look at, they are identical in evey way, they bolt onto the manifold the same, oil lines etc, all the same, just rear housing is 0.68 instead of 0.37 standard.

It will spool up easier and faster and supply more boost, but should be intercooled, even a little one, if boosting over about 6-8 lb.

If it has the STOCK T25 turbo on it, source yourself a T25 from an FJ20DET. To look at, they are identical in evey way, they bolt onto the manifold the same, oil lines etc, all the same, just rear housing is 0.68 instead of 0.37 standard.

It will spool up easier and faster and supply more boost, but should be intercooled, even a little one, if boosting over about 6-8 lb.

FJ20 came with a T3 as standard, best to my knowledge the first T25's were on the CA18DET....

Next question:

Is there size/capacity casting marks on the block?

If I wanted to make my PNV a sleeper looking all stock & standard, could I get an L28 block & change the engine numbers to L20 and get away with it, or has it L28 on the side.

yeh they have L28********** stamped on them in the usual position.

bear in mind mine was originally an l24 and now its a l28 no mod plate nothing, just notified the rego department?

Guest
This topic is now closed to further replies.



  • Similar Content

  • Latest Posts

    • Yeah, plenty of air flow, there is a dedicated path that feeds the air in to the OEM intake tube behind the bumper As for a "tangible effect", maybe, but getting the pod/intake air out of the hot engine bay is worth it psychologically to me, even if it gives no performance difference, so the tangible effect in my Lizard brain saysss yessss  In the end, to me a tangible effect isn't always about performance, sometimes it a sound or a look, or even a...... feeling  Ooga-Chaka Ooga-Ooga Ooga-Chaka Ooga-Ooga Ooga-Chaka Ooga-Ooga Ooga-Chaka Ooga-Ooga
    • yeah first and reverse is where you will find clutch release issues (whether hydraulic or mechanical) because the difference in revs required is the highest there; particularly changing down from 2nd to 1st when still moving. To be clearer though, it is possible that the clutch release bearing is the wrong height. This is less likely than a hydraulic issue but it is not unheard of when you are mixing and matching
    • Quite right, if you make it to that pension you deserve every cent
    • Hi all, Restoring r33 series 1 rb25det. All the heater hoses were on their way out, have replaced them and put it all back together. After testing I noticed a small leak from behind the head on the actual metal water line to the turbo when cars warm. I tried running a longer hose over it but it kept leaking...   I am about to take the (stock) manifold off again😔 to change the water line does any one have any lines they recommend? I was looking at Aeroflow Turbo Oil & Water Line Set but not sure what everyone else recommends. Car is completely stock but want to upgrade turbo eventually. it looks like ill have to disconnect a lot just to replace these lines so if there's anything else recommended to do please let me know. Thank you in advance!
    • From memory, on the R33 GTSt at least, while everyone says "It's not adjustable", I found when I changed clutches in mine, it just needed a small adjustment on the rod length. But be very wary here, as you could end up trying to push the pushrod in the master too far, or blowing out the slave.   Most likely though, if the master/slave isn't bypassing internally or leaking out, then the throw out is the wrong height compared to the fingers on the clutch, so when it moves to disengage the clutch, it isn't 100% disengaged. You can check part of this out too by jacking the car up, having the engine running, put your foot on the clutch and try to engage 1st gear. If it goes in pretty easy (Compared to the ground) and/or the wheels start turning a fair bit and it takes a bit too much brake pedal to bring them back to a stop, this is likely the issue.  I'm not sure if you can adjust the height of the forks etc in these though, it's been that long since I've touched any RB gearbox.
×
×
  • Create New...