Jump to content
SAU Community

Recommended Posts

Those are interesting results that you have there.

My car made 164.9rwkw on Mercury's Dyno with the following mods only:

*3" Dump from turbo, into stock pipe 2 inches??? This is what I was told by the guys from the shop?

*Standard Cat

*3" Mandrel the rest of the way and a 4" Canon.

And on the intake side, a Apexi Power intake pod (not enclosed, naughty me)

And the guys said my car would benifit greatly from the type of dump you are talking about and a highflow cat, now it looks like that is what I'll be doing next.

Importantly however, comparing my dyno sheet to yours, it seems yours has a bit more 'meat' throughout the whole range before reaching the peak power.

  • Replies 46
  • Created
  • Last Reply

Top Posters In This Topic

BTW, i can post up my Dyno sheet for anyone who would like to compare my results to the above results.

I don't know how much use it would be, quantifying different results on different cars, but it may be of interest to someone.

Hey guys, most of you have the right idea about the split dump, most importantly, the drop in kw on the dyno was only between 6500 - 7000 RPM this was due to the stock cams. i have since reset my ECU and it feels even better on top end.

BHDave: its a full 3" system with high-flow CAT... read the original post for full details...

If anyone is intrested in this setup... for R32, R33 and R34 contact Jimmy at Liverpool exhausts.... tell him Sarkis sent you.. and for the Dyno and ECU tuning contact Adam at Just Engine Managment.. These guys are the best of the best and look after their customers!

www.justenginemanagement.com

www.liverpoolexhaust.com.au

There both located in moorebank NSW

Regards,

Sarkis

Edited by QRI05E

QRI05E - great results, what did it end up costing you if you don't mind - can you break it down..

also - you will notice with the freer flow of air boost is up ~0.5-0.8psi to redline from approx 5,000 to redline.. This would also help I would imagine..

Am definately interested in getting something like this done on mine and with the turbotech bleedvalve should make a decent difference..

Would probably reset the ECU straight away and let it relearn..

Edited by Links

So you gained 10 from the exhaust and another 10 from the revised dump. Sounds more reasonable, though there is still some conjecture about the performance of the short split dump at higher power (as in the bolt on replacement dump) vs the one piece as shown by mafia.

Thats the main thing i'm asking as the drop off as shown on the graph could well be a sign of the top end choke commonly associated with these type of dumps and may well be more pronounced when you start making more power.

Edited by BHDave

We then took it back to the work shop and fitted a single 3" dump, CATCO 702cfm CAT, 3" mandrel bend exhaust with 6" cannon...

From what I gather.. 3" split dump, 3" front, 702cfm CAT, 3" exhaust..

leads me to the same conclusion - you are saying you have a full 3" exhaust and highflow cat.

Edited by Links

Yes... both Dump pipes were tested with full 3" exhaust and highflow CAT... however the first dyno run was completely stock except for the 3" front pipe that came with the car from japan so most likely if i had a 2" front pipe too it would of been around the 140rw/kw stock therefore approx 24rw/kw increase from the split n full 3" setup. But due to the 3" front pipe the car made 144rw/kw stock..

Just a note: My split dump pipe and front pipe are one piece same as the pictures posted...

In regards to the price, every car will vary depending if you want HPC coating, mildsteel/stainless, type of CAT, type of muffler/cannon.. If you contact Jimmy at Liverpool Exhaust and tell him Sarkis sent you, he will package an exhaust set up and will look after you price wise...

Regards,

Sarkis

Evan R33,

The CES dump pipe illustrates exactly what I was getting at.

They have chose to join the wastegate in on a straight section of the exhaust, not a bend and especially not the outer of a bend.

Exhaust gas has intertia just as everything else does, once its moving in a direction it doesn't like changing.

By placing the merge on the outer of a bend your creating turbulence as the exhaust gas hits it and tries to turn a bend.

Thats the way I visualise it with ZERO knowledge of flow dynamics, could some one possibly clear this up that does have knowledge of flow dynamics???

Hey Arkon, The only thing that might need modifying would be the flange on the split dump.. i have seen an R33 in the workshop with a Garret T04 high-flow running 25psi with the same split dump i used and the flange was modified to fit the turbo housing... and it worked a treat on the dyno... The only time the dump pipe will have to be remade is you put a high mount manifold.... otherwise if the standard manifold is used, the same dump can be used... hope that answered your question...

Regards,

Sarkis

Edited by QRI05E
So you gained 10 from the exhaust and another 10 from the revised dump. Sounds more reasonable, though there is still some conjecture about the performance of the short split dump at higher power (as in the bolt on replacement dump) vs the one piece as shown by mafia.

Thats the main thing i'm asking as the drop off as shown on the graph could well be a sign of the top end choke commonly associated with these type of dumps and may well be more pronounced when you start making more power.

I have absolutely no doubt at all that a bolt on split dump will perform better than the stock item. If any of you have a look at the stock item, it is basically flat and perpendicular to the wastegate opening. The link posted below has pictures. This would cause the wastegate gases to merge with the exhaust gases at 90 degrees. Definitely very restrictive.

If you look at the stock frontpipe, it's actually a reasonably designed pipe. Up to the limits of the stock turbo, changing the dump alone (without changing front pipe) should eliminate restrictions.

Best bargain upgrade would be to just change the dump to a split item, which is cheap e.g. for sale atm:

http://www.skylinesaustralia.com/forums/in...topic=97734&hl=

compared to the price of a full split front/dump for 450 from batmbl.

Is that in comparison to the other dump that is for sale in the link above?

Or you mean in comparison to the entire dump/engine pipe combo?

I was referring to the link in particular not the entire combo pipe that batmbl sells.

Edited by RB30-POWER

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

    • Did this end up working? Did you take some pictures?
    • And finally, the front lower mount. It was doubly weird. Firstly, the lower mount is held in with a bracket that has 3 bolts (it also acts as the steering lock stop), and then a nut on the shock lower mount itself. So, remove the 3x 14mm head bolts , then the 17mm nut that holds the shock in. From there, you can't actually remove the shock from the lower mount bolt (took me a while to work that out....) Sadly I don't have a pic of the other side, but the swaybar mounts to the same bolt that holds the shock in. You need to push that swaybar mount/bolt back so the shock can be pulled out past the lower control arm.  In this pic you can see the bolt partly pushed back, but it had to go further than that to release the shock. Once the shock is out, putting the new one in is "reverse of disassembly". Put the top of the shock through at least one hole and put a nut on loosely to hold it in place. Put the lower end in place and push the swaybar mount / shock bolt back in place, then loosely attach the other 2 top nuts. Bolt the bracket back in place with the 14mm head bolts and finally put the nut onto the lower bolt. Done....you have new suspension on your v37!
    • And now to the front.  No pics of the 3 nuts holding the front struts on, they are easy to spot. Undo 2 and leave the closest one on loosely. Underneath we have to deal with the wiring again, but this time its worse because the plug is behind the guard liner. You'll have to decide how much of the guard liner to remove, I undid the lower liner's top, inside and lower clips, but didn't pull it full off the guard. Same issue undoing the plug as at the rear, you need to firmly push the release clip from below while equally firmly gripping the plug body and pulling it out of  the socket. I used my fancy electrical disconnect pliers to get in there There is also one clip for the wiring, unlike at the rear I could not get behind it so just had to lever it up and out.....not in great condition to re-use in future.
    • Onto the rear lower shock mount. It's worth starting with a decent degrease to remove 10+ years of road grime, and perhaps also spray a penetrating oil on the shock lower nut. Don't forget to include the shock wiring and plug in the clean.... Deal with the wiring first; you need to release 2 clips where the wiring goes into the bracket (use long nose pliers behind the bracket to compress the clip so you can reuse it), and the rubber mount slides out, then release the plug.  I found it very hard to unplug, from underneath you can compress the tab with a screwdriver or similar, and gently but firmly pull the plug out of the socket (regular pliers may help but don't put too much pressure on the plastic. The lower mount is straightforward, 17mm nut and you can pull the shock out. As I wasn't putting a standard shock back in, I gave the car side wiring socket a generous gob of dialectric grease to keep crap out in the future. Putting the new shock in is straightforward, feed it into at least 1 of the bolt holes at the top and reach around to put a nut on it to hold it up. Then put on the other 2 top nuts loosely and put the shock onto the lower mounting bolt (you may need to lift the hub a little if the new shock is shorter). Tighten the lower nut and 3 upper nuts and you are done. In my case the BC Racing shocks came assembled for the fronts, but the rears needed to re-use the factory strut tops. For that you need spring compressors to take the pressure off the top nut (they are compressed enough when the spring can move between the top and bottom spring seats. Then a 17mm ring spanner to undo the nut while using an 8mm open spanner to stop the shaft turning (or, if you are really lucky you might get it off with a rattle gun).
    • You will now be able to lift the parcel shelf trim enough to get to the shock cover bolts; if you need to full remove the parcel shelf trim for some reason you also remove the escutcheons around the rear seat release and you will have to unplug the high stop light wiring from the boot. Next up is removal of the bracket; 6 nuts and a bolt Good news, you've finally got to the strut top! Remove the dust cover and the 3 shock mount nuts (perhaps leave 1 on lightly for now....) Same on the other side, but easier now you've done it all before
×
×
  • Create New...