car got tuned but i have a turbo flow problem

[BQ.05.TD]

so i got me car tuned the other week and it made 190.1kw on 13psi. i was pretty happy with that power. so then we started screwing the boost into it and on 19psi it made 198kw. so i only got 8kw for 6psi extra boost pressure. wtfi have a gt2876r .64my tuner thinks its the rear housing causing the restriction. but i have seen plenty of .64 housings make more then 230kw which is my goal figure.i have checked my cat and its fine and so is the rest of the exhaust.i spoke to a bloke at GCG and he had a ca with 2871r and made 233kw on 20 psi. so where am i going wrong i know the 76r isnt the best turbo but surely it would be able to make the 230kw im aftermy 3mm thick steam pipe manifold that is HPC coated was glowing red hot at the collector and my tuner only sees that on big boost carsthe motor has great compression and every thing in spot on

he spent a full day on the car,playing with the adjustable cam gears ( stock cams atm)if any one has any ideas i would love to here them

[bentvalves]

what ecu?

try adding a few degrees of timing and see what happens to the power.

[BQ.05.TD]

microtech. my tuner tried heaps of diffrent stuff but just didnt do any thing

[mbmbmb23]

so i got me car tuned the other week and it made 190.1kw on 13psi. i was pretty happy with that power. so then we started screwing the boost into it and on 19psi it made 198kw. so i only got 8kw for 6psi extra boost pressure. wtf

i have a gt2876r .64

my tuner thinks its the rear housing causing the restriction. but i have seen plenty of .64 housings make more then 230kw which is my goal figure.

i have checked my cat and its fine and so is the rest of the exhaust.

i spoke to a bloke at GCG and he had a ca with 2871r and made 233kw on 20 psi. so where am i going wrong

i know the 76r isnt the best turbo but surely it would be able to make the 230kw im after

my 3mm thick steam pipe manifold that is HPC coated was glowing red hot at the collector and my tuner only sees that on big boost cars

the motor has great compression and every thing in spot on

he spent a full day on the car,playing with the adjustable cam gears ( stock cams atm)

if any one has any ideas i would love to here them

So you turned up the boost but you didnt mention changing the ECU map and adding fuel. If the manifold is glowing its running too hot.....if changing the timing isnt getting it done....add fuel to the map.

[bentvalves]

well just because the mani is glowing red hot doesnt mean its lean.

after burnouts up my driveway, my manifold/ turbine housing glow red seen clearly in the night.

this is normal for a turbo car running hi boost.

[zmannz]

sounds like like a timing issue to me, I had a z31 that would make the turbo glow if you ran it hard for 15 minutes tuned and running a wideband and megasquirt. After a timing belt change and new seals it worked GREAT. I can only assume it was off on the timing, that was all I changed.

[float_6969]

Why are you using a steam pipe manifold? The stock FWD bluebird manifold would probably be less restrictive and spool just as quickly. It sounds like he did everything he could to it from a tuning standpoint, which means you have a mechanical limitation in your setup.

How big is your intercooler and piping? How big is the exhaust, both the manifold and the turbo back? What about that steam pipe manifold. Is it a log, or equal length?What about the intake of the turbo? Has anything been done to increase flow?

[BQ.05.TD]

So you turned up the boost but you didnt mention changing the ECU map and adding fuel. If the manifold is glowing its running too hot.....if changing the timing isnt getting it done....add fuel to the map.

i dont mean to be rude man but do u realy think that he just added boost and ramped it up?

yer i know jsut because the manifold is glowing red dosent mean its lean. they all do that after a work out but 3mm thick and ceramick coated it shouldent be glowing on 19psi like it did

its a 1 1/4" ID steam pipe. the best stuff you can make a manifold out of IMO and have you ever tried to fit a gt35 front housing between the block and radiator. and even when you can its that low that the oil drain has to go 6" norththat is the manifold

[Buddyworm]

How does the runner length compare to the other guys you talked to? I'm no engineer, but I bet you all the bends and the friction along the walls of that pipe will really hinder your exhaust velocity. If it's not moving through the mani as fast that also means it spends more time in there heating up the metal.

[BQ.05.TD]

its abit longer then norman but that dosent matter. its still working how it shouldthey are all equal length with in 10mm

[float_6969]

He's right, the runner length and diameter is fine.

Have you checked the ignition timing? Are you sure it's doing what it's supposed to when you make chances to the timing maps?

What about the cam timing? Maybe it jumped?

[Ca_Silvia]

Some food for thought from your first post.

I have 3" turbo back and ended up with the same whp as you. My setup was 2871r .64 @ 15psi. IMO, I don't think your issue is exhaust related.

[1fast200]

Check your timing!

RYSO.

[mbmbmb23]

i dont mean to be rude man but do u realy think that he just added boost and ramped it up?

yer i know jsut because the manifold is glowing red dosent mean its lean. they all do that after a work out but 3mm thick and ceramick coated it shouldent be glowing on 19psi like it did

that is the manifold

He didnt mention modding the map...so I have no idea. Ive seen worse on this board. I was under the impression he bumped up the boost with no fuel/timing MAP mods and it was running lean and thus glowing when it shouldnt have. End of story.

[BQ.05.TD]

well alot of people have said check timing isnt out a tooth so i spent half the day sunday going over timing at the shop and every thing is spot on. dissapointing actually as it would of been a easy fix, but now its starting to turn into some big moneys to get the power im after.

i dont know if i should go 2871r .64/.83 or 3071r with t25 rear housing( im htinking its gonna be that same problem as before) but i could be wrong and garrett say its the "best" flowing turbo with T2x rear housing

also wat would lag be like with 2871r with .84 rear housing?

[float_6969]

Once again, did you compare the programmed timing to the actual timing? We had a standalone get hooked up wrong once and it would retard the timing when you tried to advance it and vice-versus. It took FOREVER to figure that one out. It was on a haltech though, so maybe that can't happen on a microtech.

I assume AFR's are OK?

What is your ignition setup like? Maybe you're blowing out the spark on one of the cylinders with the increased boost? Have you tried closing the gap on the plugs down a little big?

[BQ.05.TD]

we havnt looked at the ecu timing as i dont know much about it and i wasnt at my tuners work shop. but my tuner is pritty switched on and i would like ot think that he has looked at that allreadyi will be punching out my cat soon as there was a heat spot on the exhaust just before the cat.yer afr are good.

plugs are gaped to .8 and i have splitfire coil packswe tried .6 plug gaps and didnt do any thing. the plugs are also a hotter heat range

[float_6969]

This issue was from a guy installing the standalone himself and never having done it before. If a professional installed and tuned it, you'd be fine.

You could actually open the gap up more than .8 with those splitfire packs. They've got some punch from what I understand.

That heat spot is interesting. I'll bet you found your problem. Let us know how it goes.