I put a turn buckle on my '01 to keep the wastegate closed and get more boost. A very common practice on the 2nd gens but I don't see it on the CR trucks. Bad idea? I'll be running the juice with attitude.

 

Look up boost elbow.....no need to buckle???? Just a brass elbow that you can adjust the boost to a safe level you choose!

 

Should not hurt anything if your boost does not get above 32 psi on the stock turbo. I installed a gas cut-off valve in-line in the hose and currently have it closed all the way off.

 

I bought an elbow on Ebay for $20.

Installation was very easy, also.

I could get 22-24 PSI before and now I can his 34-37 PSI, if needed.

 

X2 on my 1st turbo, cheap and effective

 

you could just take the stock fitting out and put in an 1/8 pipe plug and run with no wastegate.

danny

 

the only thing you'd be gaining is slightly faster spool up in the mid range. your drive presure WILL go up, egt will more than likely go up, and intake air temp will go up. the only things that will go down is air dendity and HP.

we did tons of dyno and road testing on my truck with alot of diferent variations of mods. best hp, coolest egt, lowest drive presure etc all occured with the wastgate starting to open at 23 psi, wide open around 25.
with out posting all the variations, i made about 370hp @ over 1400 degrees with the wastegate blocked off, that was makeing over 40 psi. hooking the stock wastgate back up, i made 400hp at barely 1100 and only 30psi ( wastgate fully open @ 25)
playing with a boost elbow @ various settings had various results, all being negitive. egt did go down slightly with opening presure around 25-26 but so did hp.

so, yha... just a nreminder that boost does not = hp, or allways lower egt.
low drive presure with high air density is key!

 

if i recall , drive presure @ 32psi boost ( wastegate open ) was around 60psi, with the wastegate closed it was over 70!

 

Yep, there's a reason we keep telling everyone not to push the little '03-04 stocker pass 32 psi. Anything above that is just pushing really hot air and killing the turbo with no additional benefit in power.

MikeyB

 

Please explain the difference between drive pressure and boost.

 

Exactly, but you do want at least 30 psi if your fueling hard. Anything more than a Smarty 5 or 7 needs a bigger charger.

 

DP = exhaust pressure to drive turbine
Boost = pressure intake manifold sees from your turbo through the intercooler

 

Gus 03, do you have any more facts and figures to share from your experiments, very interesting stuff you found out there?

Was 400 Hp the most you could push out of the stock turbo? I have noticed on the larger compressor wheeled HE351 that HP continues to rise even as boost goes north of 40 psi. No one that I'm aware of except except maybe XL8R has tested the HE351 past 45 psi.

 

Many have pushed the HE past 45 psi, but not many have done dyno runs, turbo discharge temps, etc above 45 psi.

The two guys I have talked with about 540-550 HP on the stock HE351 both said they were in the 50+ psi range on boost. It is interesting that the HY9's and HE341's choke at such a lower boost range.

 

Yep, reason enough to mod an 03-04 w/ an 04.5+ turbo. I've seen over 440hp w/ Smarty/Quad and my stock 03 turbo around 29-31 psi.