Built motor I assume? Do you have a dyno chart you could post?

 

Yes. You and Rich are correct. PL GT37R numbers were accomplished with stock manifolds.

The 906whp with the 76S turbo was done with stock passenger side manifold and an aftermarket header on the driver side to allow fitment of the larger 3.5" downpipe and T4 flange.

 

this can happen, just been so busy with everything else. Just ordered a boost controller from Dustin today. we were playing a manual boost controller and thats like playing with dynamite. No sense in having a Haltech, compete fuel system, 950cc injectors, Cosworth plenum, Cosworth heads, and the kitchen sink just to have a $30 boost controller bring the whole thing down. Should have boost controller next week.

Hmm, how to plan a three day road trip to let Hal have his way with our car.... lemme run that up the flag pole and see who salutes.

sorry to hijack.

 

yeah, that was a 40k mile motor, built low compression and stock head/cam. uprev tune with utech over boost protection and knock detection

 

Sasha, what we see with our headers is spool up and torque is better with our headers verses stock manifolds. our headers are near equal length (within .3") and 1.75" primaries and a merge style collector. I'd have to pull actual dyno charts (and will tomorrow for you) but we do see quicker spool up and quicker torque ramp up. Like I posted earlier we really haven't tried to find the limits of the manifolds since we had always planned on headers to work NA and with the turbo kit, now i wished we had but hind sight is generally 20/20.

Hope this helps. tomorrow is pretty crazy for me, but I'll try to find what we have on the dyno computer. whatever I find will be low boost tho (8-10 psi) we always assumed if someone was going to go deep enough to build a motor to go FI with our kit, that headers would be a nice progression piece to go with that.

 

Well, I did manage to rip appart a set of OEM headers:

It all looks ok up to the cut:





But after that it gets ugly:





There is about 8" of 1.5" tubing here, and I just can't imagine this flowing/supporting THAT much HP.

 

Bryan, thanks for sharing. There is no issue with stock blocks at all, I am more geared towards built motors with possible head work where flow can be a concern. I have a few customers at 450whp at about 10-12psi of boost on stock blocks and no issues there at all.

As I am sure you already know, built engines are completely different monsters.

 

493whp on DD with PL kit on 91 oct. which is around +560whp on dynojet.

 

Thanks for posting. Cams/head work?

This also looks like a GT37r turbo.

 

would be interested in seeing what a equal length tubular header setup would net. however wouldnt having larger piping leading to the turbo (mid mount) increase lag (albeit significantly)??

 

That’s the thing; many people have this misconception that the turbo is far from the engine/headers. In fact it is closer to the headers than the turbo on the top mount kits (and yes I have measured). Not only that but all the piping is 2.5”, and not a single bend greater than 45deg, and we all know that this is good for flow. Here is a picture of the exhaust piping between turbo and headers, as well as turbo to FMIC:






In other words, lag is not an issue at all here. Headers however will help any ST kit.

 

Sounds great......when's the production date...... :-)

 

sounds like youve got yourself a solid kit there. that piping looks great too! i would imagine temps arent bad at all, but has anybody wrapped/coated your kit for increased spool up?

also has anybody used a larger exhaust after the turbo?

 

Nope, it's GT35r with stock heads and nismo R cams.

 

Here is the dyno from one of my customers, I don't think spool is a concern seeing that the car made 400ft/tq at 3800rpm:



This is on a bone stock DE at 11.5psi, with the smallest turbo I offer (T4 .58 a/r), and exhaust cut out after the DP. This is also a JB turbo, a BB would look even better.

How big of an exhaust are we talking about here (after the turbo).

 

I know this is OT, but is it possible to run a mid mount/rear mount turbo w/ long tube headers?

I'm thinking rear mount is more feasible.

 

looking pretty good. reason im inquiring about spool up, working out a custom mid mount single for my ls1 swap so been digging into this idea quite a bit, and using this as well as ls1 specific mid/rear mount kits for reference. im also curious on how it would spool on a built low comp motor with aggressive cams. also, is the kit upgradable (is there room to upgrade without touching driveshaft, etc.)

as for the exhaust, anything from 2.5-4.0 after the turbo to get the exhaust out quicker (half the battle lol) as well as various open dump options.

how are you getting oil back to the pan? a pump i assume?

 

couldn't find my 530whp dyno this one is stock block greddy twins, they seem very laggy compared to the single turbo graph above. however my tq is ulta FLAT and only drops about 20-30 tq were the single is dropping almost 100wtq.

 

I was asking about STOCK HEADERS power not stock block..

 

i know i dont have that graph sorry this was all i could find. i may have a couple from the st kit but they were on much lower boost like 7-8psi