The car used to hit redline pretty hard and quick before with the stock top mount on my U12 BB DET.

Now I've just had a front mount put in, with ally piping, etc. And it seems a bit slower and certainly laggier. It used to hit 7psi really early and hold it.. now it hits 6 or 7psi a bit later in the revs... and when on boost doesnt seem to "pull" as hard as before..

any ideas? I'm thinking maybe the stock 6psi is too girly for my new i/c setup? Perhaps I should get a boost controller and play with it, try 10 or 12, or even 14 psi? This was the idea for the front mount anyway, and the better cooling, etc, etc.

I know the cooler is working very well, after a thrash, i feel the end tanks, turbo side is rather warm to touch, other side is very cool, its almost like its been in a fridge, awesome...

6psi not enough juice to be pumping thru newer larger core?

Thanks, James

Sounds rite to me. The piping takes a bit longer to pressurize. When I first installed my DET I had a 3" pipe going from the turbo rite to the TB. Man it was fast as hell! It would hit 9psi as soon as I pushed the throttle :) After I made the FMIC piping it was a bit laggier.

Try the boost controler they work alot better even if your just running a few psi over stock. They tend to make the turbo spool faster and it dosent drop off as much higher in the rev range.

Mike

Might be an idea...But what size piping are you running? I guess on either side...The side coming in and side coming out? That could be a problem maybe...Could be a boost leak...I/C piping could be loose, etc...Cause it should lag sooooo much it alot slower? But also how large is that intercooler too?

Guys, thanks for that, makes me feel a bit better, you know how you always stress about crap like that, you spend a truck load of cash on something new and it doesnt work like you want it to.. heh

Umm the core is about 500mm x 250mm x 2.5" thick. It's an ideal size, the end tanks look good, I'll have to get some pics going, the pipe work is 2.5" from what I can see.. There's a reducer on the TB so I'm thinking thats reducing from 3" to 2.5" ?..

The pipe work is short, and the bends are great, it's all done in aluminium too, very nice welding, good job...

Boost leak? not sure, my gauge still reads 6 or 7psi when its up and pumping.. it just seems like the revs arent pumping up as fast as they used too, needle is moving slower or something, hrmmm.

I'm guessing 6psi (stock boost from stock det and stock turbo) is just too girly for the new pipe/i-c setup...

What could I run safely? 10 or 12 psi? I'm still running the DE fuel pump, so I want to be careful here..

Thanks again!

Guys, I fixed the problem hahaha. I was at dads and we were admiring the pipe work, when I looked at the turbo and noticed a GAP between the turbo outlet and the pipework/bracket.

It was about 2 or 3mm gap! I turned the car over and we felt.. huge gush of air pouring out... at idle! so no wonder it was struggling at around 5k revs and reading the stock 6psi on the boost gauge.

I took it home, remove some pipes, worked on getting the fitting flush on the turbo housing, and put it all back together, went for a thrash, and b00yah!!! damn. hit 8 , 8.5 almost 9 PSI on the boost gauge... yummo.

The car just rocketted forward so nicely hahaha THERE IT IS I though....

I'm much happier now! cant wait to try a safe 10 or 12 psi... mmmm damn

Thanks dudes, James