so few days ago i decide to test out the nitrous , and i prolly shouldnt have started with a 100 shot but i did.

i have a tpi plate kit on my twin turbo camaro , and decided to hit it with 100 shot @ 15 pounds of boost , afr held between 10.8-11.0 on the nitrous. it didnt pop or bang but i burnt both head gaskets between cyls 5-7 and 6-8
timing was locked to 16* total

im going to blame the stock felpro replacement gaskets and stock headbolts for now but im curious as to what u guys say

somone on the turboforums is running a real similar combo hitting it with 75/100 shot at 20+ psi of boost and isnt loosing headgaskets


should i ditch the tpi plate and switch to a single fogger / wet or dry hit ?
take more timing out , to rich to lean etc

 

Are you using the blue felpro head gaskets? im curious because i am too and i was considering 150 shot but now i might hold off....might

 

what kind of fuel were you running?
plate should be fine.
why are you spraying it? why not turn up the boost since you have a pair of 72's on it?

 

if its setup/tuned right i dont think the head gaskets would have a problem.

 

you're boosted also? the OP is boosted with twin 72mm turbo's and he's sparying...if you're just spraying you'll be fine.

 

sorry for the confusion guys , this is on my 355 sbc iron heads , and twin 57mm turbos, unfortunatly it wont be till late winter that my 427 is finished and ready to be put in the car


92 pump , the plan is to spray it with 75/100 shot when im up at 19-22 psi , with the methanol injection spraying 100% methanol

i didnt want to test the nitrous out an any higher boost level , this is my first time playing with nitrous and boost so .... well besdies the 35 shot i ran on my turbo v6 car for a short while

 

Twin turbo, 15 pounds boost, and a 100 shot.

I agree, you need help...

 

so i have been told lmao
i dont know if u happened to see martys car ( the grenade) but my build for the time being is a copy of his, fairly stock small block with lots of boost and nitrous

his went 9.17 on boost and a 75 shot iirc , im hoping to go faster with my stock junk before i put the good engine in it


so far my car/build has a really high thrill/smile to money spent ratio

 

How did the plugs look? Head gaskets blowing is alot of cylinder pressure and likely heat. I would look closely at the plugs and consider pulling more timing when spray comes on.

If its happy at 16 deg on boost alone, i would consider pullin more on spray. Try 2-4 more and see how it reacts. Also check plug heat range, may want an additional step downward in heat

 

its happy on boost all the way upto 21* upto 15 psi , for now i have the timing locked out at 16* cause i cant always fill up with the good stuff in my area.
once in a while ill get stuck filling up with 89 , so locking the timing at 16* saves me from having to pull out the laptop if by chance i cant fill up with 92

for plugs im running ac delco r42's coldest plug they have ill have to cross refrence it and see what i can get in an ngk or other plug

plugs looked ok though i did have them gaped at 030 might have to bring it down to 022 , ive had it upto 19 psi on boost alone with that gap and it ran good, maybe witht he extra cyl presure from the nitrous it couldnt handle that large of a gap

 

Nitrous adds alot of heat which in return generates cylinder pressure. May need to find timing that keeps head gaskets happy but lose power potential.

Studs and mls gaskets will stop the gasket issue but i dont think the motor will live long lol

 

ur propably right and id rather change head gaskets then engines , as this one isnt actually a stocker, its got a factory forged crank, decent rods , and forged pistons


today i decided to bump the timing back up and it really woke the car up, my job is 3 blocks from my house on the main street in town, so today i get on it pulling out of my driveway and left about 2.5 blocks worth of tire marks down main street , in 1st 2nd and 3rd gear oppps lol


im thinking if i have to pull that much timing to run the juice i may as well just run it all boost

ill back it down to a 50 or smaller shot and see what it does, im mainly after the extra cooling from the nitrous at high boost so a small shot should still work well

 

only when your running lean..

I like my nitrous. the way I like the ladys.... rich and retarded!

remember to NEVER tune with fuel presher!

 

No regardless of rich or lean it still has alot of heat. Bigger the shot the more heat. Your tune can be spot on but still have heat problems. May not be as prevalent with small shots but very important when looking at big shots or spraying for longer periods of time

 

would you like to try that again?

 

pressure...is that better.....Glad I did not use Caps!!..pOLICe are every place!

I don't. and have not seen a lot of heat when using it...

been doing the NOS thing from 1984..
have been running foggers (more then 7 Nozzles) for 15 years.
have run up to 400hp hit. but then its less then 6 sec total TIME ON button.

just me I Guess.

the only time I can tell if its getting hot less then a few sec. if its lean. is small Specks of alum on the plugs and the electrode starts to go away.=Lean=Heat..

if your talking about heat from the boost from nos.making power.then we are talking about to diff things.
I was talking about running lean...heat sorry
as my eng has always run 180/190 at the tracks. iv never ran a head temp unit in the headers

 

Blown head gaskets huh.Not to tell a tale.But are the top rings gaped for either the turbo and or the nitrous?If I burned out head gaskets I think the next logical thing I would want to look at due to the heat is if the top rings where damaged.

 

yes i have the right ring gaps , the motor was built with the intention to boost the hell out of it and spray it

 

im not exactly sure what happened at this point, but i would tend to think too much timing and i wouldnt be playing around with pump gas with that situation. also would need some pretty cold plugs. 8 or 9 heat range i would think, and non-projected tips.

 

ill be playing with it tommorow at the track

ive backed the nitrous shot down to a 75 shot , i know u guys suggested pulling timing but its at 16* total already

u guys still think i should pull timming ?

 

out of curiosity, what's your quench?

 

ill have to look threw all my engine build notes but if i recall corectly

piston is .05 in the hole .020 compressed gasket , but im also running a .120 popup dome piston

 

That's pretty tight dude lol, doesn't leave too much room for error

 

.05 or .005 in the hole?

 

was the only way to get the compression up with the 76cc heads

 

opps nice catch .005 its almost 0 deck

 

Ya figured that's what he ment, .025" quench on a forced induction / nitrous motor I don't think is a good idea, especially if he's still trying to tune the thing. Put a .060 gasket on that bitch .

 

just tossed it in a calculator and im getting around 10:1 static compression. iron heads, 15+lbs of boost, 100shot of nitrous, and 92 octane pump gas just isnt going to work, imo.

 

Did you ever consider getting an Intercooler kit for the N2O? I think people typically run 50-100 shot thrue the intercooler to cool everything down and give you some more power. Thats would seem more efficent IMO anyway, since you have a meth kit already.

Are you doing all of this through a stock TPI?
Ever run or dyno the car? Im curious as to what it would be putting out.

 

should be around 9.5-9.7-1 we reshaped the popups slightly unfortunatly i never did get to measure the dome volume after

ive got a set of bare aluminum procomps comming 210cc 2.02/1.60 74cc chambers brand new for just over 400 bucks im not expecting anything great pout of them but the wieght savings and going to aluminum heads was worth the 400 bucks spent

dont forget this is a throw away engine its all about smiles and giggles versus money spent ratio at this point

 

i think all you need to do is put some good fuel in it. like 110+. i would have been running 110 with the 100 shot by itself... lol

 

cant get any around here, best i can do is e-85 and that is 80 miles away

 

maybe you could order some and have it delivered?

 

kinda a moot point to do that , nitrous will only be used at the track , car is more then fast enough for street driving on boost alone.but it would be nice and order some fuel up so i can tune it before i hit the track , and not have to dick with it there between runs.

when the new heads get here i may ditch the n20 all together if the the engine picks up a bunch, compared to the ported 882's that are on it now im sure even the pro comp heads will make a pretty good difference

i do expect that at that point the tpi is going to limit it a good bit, for a ***** n giggles motor this thing is snowballing on me pretty quick lol , lmao by the time im done i might as well just geep the 355 in the car and build another car for the 427.

then again my 3/4 ton silverado could be lots of fun with the twin turbo 355 out of the iroc in it hmmmmmmmmmmmmm