barcode

iTrader: (1)

So my car it seems is very much slower than it should be. Mods are as follows ('87 T2); T04B hybrid (with compressor housing), 2.5" exhaust with no cats, 3" aluminum TID, cone filter, removed air pump.

Now here's my issue, the car will barely boost above fuel cut, not even for prolonged pulls in 3rd gear will it go above .5 bar (according to my apex'i guage). It doesn't even spin the tires in first gear or chirp into second, and just doesn't seem to pull very hard. The TB mod has also been done so I know that it couldn't be the secondary butterflies being stuck shut. I'm thinking it could possibly be that the twin scroll system is stuck blocking the exhaust from entering the turbo.

It seems like I should be having wicked boost creep and be pulling a lot harder than I am, so that's why I'm confused.

Any thoughts?


Thanks
Sam

J-Rat

iTrader: (2)

Well, how are you controlling boost? Is the twin scroll active, or is it wired open?

barcode

iTrader: (1)

I believe it's active. Stock WG. Wiring it open I take it would just require popping off the clip and wiring the flapper to something so it stays open?

J-Rat

iTrader: (2)

You could, but it sounds like you have other issues. Whats controlling your boost?

barcode

iTrader: (1)

I don't have any sort of boost controller other than the stock WG. I don't think it has anything to do with that though because it seems like I should be creeping, I don't even make more than 8psi.

J-Rat

iTrader: (2)

Well, that depends on if the WG was ported or not. Sounds like the WG is keeping up quite nicely and you are seing just slightly higher then spring pressure.

barcode

iTrader: (1)

The WG is ported, but it just seems like I should at least get some wheel spin and have a little more power than it does.

J-Rat

iTrader: (2)

Why? At 7 PSI you are probably not spinning that turbo hard enough to be in the efficiency range.

rotarymarine

My stock 205's in the rear don't stand a chance and I'm still running stock turbo with a few mods. I would look into your fuel system. Does everything seem to be running ok? I mean, does it drive fine when you are not trying to drive hard? I don't know if this would matter but have you adjusted your tps just for the hell of it and checked your turbo system for leaks. I know my bov screw came a little loose once and started bleading boost. I probably didn't help you very much but I tried.

J-Rat

iTrader: (2)

once you go to full throttle the ECU disregards the TPS. Just a little FYI.

And also, you are a stock turbo, which means you are inside the peak efficiency range at 5-7Psi. On a hybrid, at 7psi you arent really into any good efficiency range. Furthermore, if he isnt even making .5 bar till 3rd gear, that means in first and second he probably isnt making 5 PSI of boost.

No WONDER the car is slow..

RotaryEvolution

iTrader: (30)

7psi with a hybrid should spin the tires once the turbo spools up, i have a small TO4B hybrid and i can't keep traction in first if i try at 7psi.

the twin scroll default is open, remove the line to the twin scroll solenoid and it should stay open but i doubt this is the problem since even with the flapper closed it should see higher than .5bar, this sounds like either a large boost leak from the piping or vacuum nipples or a wastegate door issue. 7psi is the minimum most hybrids will see so unless you have a boost controller(i didnt see one mentioned) you probably won't see anything higher than 7psi until you install one.

edit: but really, if the car feels slower than it did with the original turbo i would assume the wastegate arm needs to be tightened, it sounds like the exhaust flow is bypassing and exiting before the turbo. a wideband would indicate any boost leaks by an overly rich condition while under boost.

J-Rat

iTrader: (2)

Read the thread, he isnt even getting 7 PSI till 3rd gear. So more then likely he is seing about 4-5 or so in first and second.

If you can blow the tires off at 7 PSI in 3rd with your hybrid, I want to know what it is, because at 350 wheel at 17 PSI, I could BARELY power them loose in third.

RotaryEvolution

iTrader: (30)

he said he can't spin em in first, i never said third, don't make me beat you with an ugly stick. oh wait, someone got there before me.... j/k

i edited my post since i also think he is either losing boost from a leak or bypassing the turbo so losing efficiency but it could just be a combination of tuning and normal wastegate porting, without a boost controller it is just doing its job which is eliminating boost creep but for real gains a boost controller is necessary.

hondahater

iTrader: (2)

get a damn boost controller! whats the use of upgrading your turbo exhaust and intake and not having a boost controller???