Wtb Vnt S-60

[The Pope]

Quote:

Originally Posted by SpiritedShelbys Ok don't bust my chops here but I'm trying to better understand my VNT. I've heard people say that opening the exhaust with a VNT is bad because it will overboost. Mine has always (at the gauge) spiked and held 15lbs. If you open the exhaust and increase the exhaust flow won't that just worsen the likelihood of overboost conditions? I'm considering the T-28 VNT, 2.5" catback ex, 16lb FWD computer, injectors, intercooler..etc.. the whole thing so I've been monitoring these posts.

if you use the header and external wastegate, extra the VNT can't overboost no matter how much exhaust flow.

[ironbird720]

Quote:

Originally Posted by SpiritedShelbys Ok don't bust my chops here but I'm trying to better understand my VNT. I've heard people say that opening the exhaust with a VNT is bad because it will overboost. Mine has always (at the gauge) spiked and held 15lbs. If you open the exhaust and increase the exhaust flow won't that just worsen the likelihood of overboost conditions? I'm considering the T-28 VNT, 2.5" catback ex, 16lb FWD computer, injectors, intercooler..etc.. the whole thing so I've been monitoring these posts.

this was my old vnt setup
full rebuild .20 over
new vnt turbo
fwdp stage 3 cal(16lbs)
+ 20's
2.5 exhaust/no cat/performance exhaust
2.5 mandrel bent aluminum piping
srt fmic
bov
2.5 CAI
With this setup I would spike to 20-22 lbs and settle at about 18 in the higher gears.

[ironbird720]

Here is my ported head waiting for assembly.New springs,lifters,exhaust studs and back cut valves.Head was only port matched to the FWDP ported intake/exhaust manifolds and blended back into the bowls.

[PUNKslip]

In case anyone cares, I just got my T-28 VNT back from FWD, looks awsome-like new. She used my old one for the upgrade. I want to put it together and try it, but the car is pretty beat up as far as missing spoilage and the interior is rough. I don't know whether to spend the money, or just sell it so someone else can give it a shot. So far so good Ironbird, nice setup!

John o.
Crete, Ne.

[The Pope]

Quote:

Originally Posted by PUNKslip In case anyone cares, I just got my T-28 VNT back from FWD, looks awsome-like new. She used my old one for the upgrade. I want to put it together and try it, but the car is pretty beat up as far as missing spoilage and the interior is rough. I don't know whether to spend the money, or just sell it so someone else can give it a shot. So far so good Ironbird, nice setup! John o. Crete, Ne.

Like with the GTs, does going from a T25 to a T28 mean more exhaust side like a GT 28 to a GT 30? Or is a compressor side size increase?

[ironbird720]

^^^pretty sure it is the compressor side.With the T-28 they machine the compressor housing larger to allow a bigger wheel.Ciny has got some good dyno #'s with her set up with the T-28 upgrade.