How much boost without IC, or Water Injection?

[MoparFreak]

Just curious on what you guys think is the maximum amount of boost I should run without Intercooling or having a Water Injection Kit? Thanks.

Michael

[mwinkle353]

I've been called every name in the book on this subject. I run 14 psi of un-intercooled boost. I've not encountered problems associated with the boost level. Just a broken cam, clogged injectors, etc.


I definately wouldn't go any higher. In fact, I don't recommend my levels. If you're not intercooled, then keep it stock boost.

I'm just having fun until I bust something really good. Besides, this is the motor that's getting the neon dohc head. lol


Wink

[omnivore]

Long ago, back when I was 18, I knew nothing about TD's, I drove an 86 CS, with a frozen wastegate. It was my 1st car. I didn't know anything was wrong with the car back then, when it fell on it's face at 15 psi, I simply thought that was a safety feature, and learned to shift the auto tranny myself, so I could hold a gear longer at part throttle. I used to feather the gas pedal to maintain 14 psi without overboosting, on cheap 87 octane gas, leaning the crap out of it by not using part throttle. Annhialated more than my share of 5.0 Stangs back then. The car ran strong for years, and I owned it for the better part of 250,000 kms..and beat the crap out of it the whole time, neglected the oil changes, and when it did see fresh oil, it was the cheapest stuff around. It ended up with no floor and got junked, even though it still ran well. Maybe I had a good one?LOL

Now I don't condone this kind of neglect, just stating that I ran 14+ psi all the time on cheap gas and somehow that car survived it all....despite my stupidity.

[3Bar_Mopar]

Quote:

Originally Posted by mwinkle353 I've been called every name in the book on this subject. I run 14 psi of un-intercooled boost. I've not encountered problems associated with the boost level. Just a broken cam, clogged injectors, etc. I definately wouldn't go any higher. In fact, I don't recommend my levels. If you're not intercooled, then keep it stock boost. I'm just having fun until I bust something really good. Besides, this is the motor that's getting the neon dohc head. lol Wink

You sound like me 2 years ago! Only difference was that I was running 18+ PSI on a (ohmygod!) Mitsu in my '88 2.2 Daytona!
I had no problems with that boost level about 95% of the time. I did bust a headgasket and eventually cracked a piston skirt.....that was after probably a full year non-stop of running like that and fully expecting it to happen eventually. I was planning a rebuild anyway.
100 miles straight of 80+ MPH, then doing 95 MPH to 115 MPH 18+ PSI acceleration runs against a Mustang finally did the engine in.
I think what saved me a little was that my car was stripped out from the front seats back....everything to bare metal, even the doors, I could lift the rear end of the car by myself. I think that helped not to "lug" the engine and turbo too much....plus, my O2 sensor was stuck rich and I had RN9YC plugs....I dunno.

I would definately not run more than 13 PSI MAX on a non-intercooled, especially a 2.5.

[Putter]

I ran 13psi unintercooled log with 9.5:1cr. It detonated any day over 50*. Didn't break any pistons although there wasn't a spec of carbon left on them. I wouldn't recommend it for a daily driver at all.

[fish2222]

Ive been running 13 for the last 6 months on my log 2.2 and havent had any problems. Every once in a while I get some detenation pings at higher RPM's but I just back out of it a bit and continue on.

[TurboShadowES]

i ran 10 psi on my t1 non intercooled when it was 100+ outside. i seen spikes to 15 psi with out detonation... but i didnt set it there. i think by the time i intercooled it i was creeping to 13 and holding a constant 11 in the middle of the summer.

[tonyz2897]

That makes for an interesting question for you guys in the know. How much does outside temperature effect the air temperature after the turbo on a non ic'd setup? Is there any significant difference in the boost pressure you can run without detonation between a cold winter day and a hot summer one?
Just Curious,
Tony

[Putter]

10+ degree should hold 10 degrees outlet. compressor effiency doesn't change significantly so it heats the air just as much to increase the same amount of pressure.

[MoparFreak]

Ok, I was thinking of running my Car at 11 psi. I am running 8 psi now, and am going to be driving it here a lot during the summer when we have 100* days. BTW, it's a 2.2 and I'll be running mid grade 89 octane gas. Just want every pound of boost that I can safely run. I plan on rebuiding this motor a year from this summer anyways, so when I do, I'll get a water injection kit, T2 Rods, and run 18 lbs of boost, That's the plan anyways. Also, I'm getting an A520 tranny/shifter/cables, new clutch, plus a 3" exhaust with a "Bullet" muffler.

Michael

[TurboShadowES]

dont run over stock boost unless you are going to run 91. after your run a tank of 91 even on stock boost, you wont go back to the lower grades. there is a power diffrence.

[Mario_Boost]

My T1 log no i/c new record 12.998@104.33

[MoparFreak]

TurboShadowES, thanks, I'll compare the two when I get it there. I still got 7 weeks to do what I want. I really need my tax rebate of $500 so I can do what I want, or I need to find a buyer for my 440! LoL

Mario Boost, thanks, I've seen that post. I aint that brave!

Michael

[Mario_Boost]

Quote:

Originally Posted by BBMoparFreak Mario Boost, thanks, I've seen that post. I aint that brave! Michael

Aww come on now. You know the little voices in your head are saying *turn up the boost.....turn up the boost*. haha.

[MoparFreak]

Or the little voices saying:
"Kill your motor, Kill your motor!" lol

Michael