1997 question
Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
I don't know, but I am curious to know the answers to your questions. I don't have any gauges installed yet. It would be nice to know what baseline numbers might be so I can see a problem happening before it becomes a big problem.
I have heard guys mentioning they hit 28 - 30 psi during some situations. Can't recall if they upgraded their turbos or not.
I have heard guys mentioning they hit 28 - 30 psi during some situations. Can't recall if they upgraded their turbos or not.
Posting Guru
Joined: Mar 2007
Posts: 1,842
Likes: 2
From: hillsborough nj
with stock injectors and a stock turbo i can hit a tad over 20 psi every now and then... that's with just an intake, stacks, no muffler, 3" downpipe and cat gutted i've heard anything over consistent 30psi is BAD for a stock turbo, but you can easily hit above 30 with stage 1 injectors...
Post Fiend
Joined: Mar 2007
Posts: 9,010
Likes: 5
From: Johnson City, TN.
glasseater is correct and you can hit around high 30's to low 40's with Stage II's. the diameter of factory is 1.15 in. and is not that bad of a size until you start doing big mods such as injectors.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
in stock form the 94.5 to 97 will see from 14-20. 15-18 being average. Some can see 20 psi stock. not intake, no exhuast, no extra fuel but not often. With mods the sky is the limit, well ok th thrust bearing is the limit. They are rated for 25 psi but can go higher with consequences. I regularly hit 33 before the intercooler was installed now right around 28-30psi. For a fast spool up you need to look into a smaller exhaust housing. stock is 1.15 A/R and there is a 1.0 and .84 availible also. I run a 1.0 and like it so far. Without the IC there was no lag. now I have a bit less then a stock fuel not IC truck.
best thing to be able to hear your turbo more is intake and straight pipe the exhaust. And ride with your foot to the floor and your head out the window!
best thing to be able to hear your turbo more is intake and straight pipe the exhaust. And ride with your foot to the floor and your head out the window!
New User
Joined: May 2007
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Postmaster
Joined: Apr 2004
Posts: 3,658
Likes: 0
From: Ellensburg, Washington
Know a dude who squeeze;s 43psi outta his stocker turbinator. That rig is very un-reliable with the trubo exceeding stock levels of boost by 25lbs, lol. His rig not mine.
I run an aftermarket turbinator because I blew up my stocker. Un-even drive pressures is a biotch and it'll eat a stock turbo faster then anything. Tim knows what Im talkin about....
Cowboy Steve
I run an aftermarket turbinator because I blew up my stocker. Un-even drive pressures is a biotch and it'll eat a stock turbo faster then anything. Tim knows what Im talkin about....
Cowboy Steve
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Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
uneven drive pressure is when you have 60 psi exhuast back pressure creating 30 psi of boost pressure. That would be a 2:1 ratio. ideally you want a 1:1 or better. a D66 is very close to a 1:1 if not at 1:1. unequal drive pressures make for high temps and inefficent engines.
Post Fiend
Joined: Mar 2007
Posts: 9,010
Likes: 5
From: Johnson City, TN.
So if I hear you correctly, when I put both these gauges in they should be reading the same. I would think that the boost would go up on acceleration and the BP would go up on de-cel.
Then again thinking backwards that would only be true if using an engine rake or EBPV as a brake. Am I correct. It sounds odd that these two will be the same.
Then again thinking backwards that would only be true if using an engine rake or EBPV as a brake. Am I correct. It sounds odd that these two will be the same.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
nope BP goes up as rpm (airflow out the exhaust goes up) the exhuast is pushingon the exhuast side of the turbo and is a resistance in the exhuast and creates the backpressure. backpressure would go up on decel only if you use an exhuast brake
Post Fiend
Joined: Mar 2007
Posts: 9,010
Likes: 5
From: Johnson City, TN.
Ohhhh It makes better sense now. I understand that BP will go up on accel. but not near as much as the boost I would imagine, Now it is coming together. The only real time that I need to pay close attention to the BP is under braking the rest of the time ignore it unless it somehow gets to 35-40 but if that happens I have more probs that need attention. Thanx Tim