Yo whats up everyone….I not sure what I should do….so I thought I would post on the forums….as some of you know….I have a fully built engine….new transmission….etc etc…..now here is the question…should I tune at 20 pounds of boost…..Or tune at 15 pounds of boost…..and add like a 50 shot when im racing…..the reason im asking….is because I don’t want to be boosting at 20 pounds….that’s a lot of boost….I know spraying the nitrous is adding pressure also….but I dont want to be concisely boosting at 20 pounds. I would only spray when I go to the track….any idea….any advise would be helpful

 

whoa grasshopper; just because you have a "built engine" doesn't mean you are in the clear. set a power goal and go for it.

if it was me i would stay away from the gas. with 2 power adders the cylinder pressure is going to be pretty high and nitrous can be unpredicable. bottle pressure, temp, fuel and nitrous jets play and big part.

i remember yrs ago when i thought 20psi was alot of boost.. with the proper turbo, fuel and supporting mods go all boost. get yourself a nice 18psi pump gas tune and a 25psi race gas tune... that is the way to go, forget all the other b.s..

also i want to add when you up the power everything will wear at an accelerated rated and maintence is key. i had a 7,000$ fully built supra engine throw a rod cause of a 15$ boost controller that stuck on me and i hit 40psi+ of boost because i wasn't inspecting my stuff and a piece of dirt clogged the boost controller line.

always check everything and for all you boost-happy people out there carry fire protection. hot engine oil will go up like gasoline on a hot exhaust manifold that just seen a bunch of boost. i learn from my mistakes and 20k later in
damages

 

well firstly there is a limit of how much power you can make on 93 octane. What those limits are very a bit depending on how your motor was setup. camshaft selection, compression ratio, efficiency of other components, head porting, intake manifold design, and valve design are all important in how that is determined. Boost is not boost. Remember, boost is irrlevent. What you want is HP and people confuse the two. To get good power you're better off with a slightly larger turbo running less boost than trying to push a smaller one and losing efficiency. The larger one at less boost will always make more power and run cooler and safer. I'd say a nice setup with stock head and cams can make 400 WHP on pump fuel. More is possible with head porting, camshafts, larger valves, and many other modifications but I guess without more information on your motor setup it is hard to say anything to your question. I would say stay with boost, how much depends on many factors. Don't forget the most important one which is ECU choice.

 

I ran in a friends fully built Supra at 19psi.. that was incredible... They said it was going to run 36psi at the track..

Get a really good boost controller where you can run 13-14psi daily driver, then switch to your 20psi when you race..

 

I never said that because i had a built engine i was in the clear....i didnt everything right from day 1.....i got new block.....pistons at 8:5:ratio....bearings...mains....cams...injectors fuel pump..rods....the whole 9 yards.....new tranmission....everything ive been having this goal set for a long time.....and i was just curious as to waht u think its safer i know how boosting works...and i know that you can only make so much power on 93 gas....so i want know opinions on what 2 do....if i should run the small boost and get the nitrous shot...i know everything about nitrous from jets to bootle pressure and temp...thats not the issue...____ would be produced better power and would be safer....people say that nitrous isnt safe...but if you do it right nitrous is fine

 

What was your goal? If 15psi is reaching it then go with that idea if 20 psi is then go witht that. But if you spray it every time you race it could add up to be alot more then 20psi. I would go with 20 though, something i read somwhere it said, " Nitrous is like that girl with STD's, you wanna hit it but you're scared of the conciquences".

 

I would recommend to get a standalone, a decent sized turbo setup (NOT a T3/4, at least a GT30 if not 35 or 37) and tune your setup 100%. See how the power looks and if it is enough for you. THEN make a decision on if you want to add nitrous to such a setup. If you did everything right 400 WHP at the minimum is easily achievable and I would say 440+ with the right camshaft and head setup. At this point it comes down to tuning and of course a standalone is mandatory for both reliability and power. If you want even more power a water/methanol injection can increase power by at least 10%. Race gas is even more power but I suspect you want as much as you can on 93 pump fuel.

 

i'd like to know what cams your running

 

i do have a new turbo....i have a GT3071R WG....


Ripps Mods...a company on Long island makes protype cams for are car...and he put them in my car

 

3071 is a bit smallish especially for this larger motor but should still work well and make you 400 WHP on 93 octane. Do you want more than that? We are using the GT37 with a 40 compressor wheel on our new kit and it works extremely well especially on 93 octane. We are making 340 WHP on a stock motor at only 10 PSI.

 

great advices above. take it to heart and listen to them.

as for choosing between boost levels, look into dual stage boost controllers.

 

i got the gt3071R WG because it fit on my flange.....yea probly looking to make little more power then 400whp....im bring it to my shop tomorrow have a talk with him and see

 

As for boost controllers I would recommend an Apexi AVCR. That is what we used for our test subject car and it worked flawlessly. Being able to lower boost to spring pressure in 1st gear and get full 10 PSI of boost in all others helped with traction issues tremendously. It also adjusts itself to maintain 10 PSI nice and flat automatically. Makes it a lot easier to setup.

 

If you are using T3 flange you can go to any turbo up to GT35R as well. If yuo are using the NEW Garrett vband housings than you can go GT28-35 no problem. 40 and above use a larger vband.

 

Ok, first of all you have low compression pistons so you you have much better knock protection. So, basically running 20 psi is the same as 15psi on stock compression. You also have cams which increases your V/E and allows more boost on pump gas. 20PSI should be perfectly safe daily driven and no problem as long as you have:
A) good gas 93 octane or better.
B) good Engine Management.
C) A good tune.

Don't let these guys scare you, that turbo is worthless if your not going to run at least 15-20 psi.

 

Well I would be so quick to say that. Until you tune the car you don't know what kind of boost he can run safely on 93 octane. Will it be 15? 18? 20? The knock threshhold on his motor is based around a variety of factors non of which we know until he tunes his car and sees how the numbers look. The good news is not a lot of ignition advance is necessary on this motor so as long as you have a standalone handling ignition timing you can run mild timing and increase boost to the threshhold and the EGT's should look okay. Overly advanced timing is the number 1 reason for detonation on this car so pay careful attention to those ignition maps.

 

Exactly why a "good tune" was mentioned. He has lowered the compression by quite a bit and has better V/E with the new cams. Not to mention the large hotside on the GT30.
He should not have the detonation problems that a stock motor would have. Remember that many cars that have 8.5 compression stock, run almost 20psi stock on 91 octane.
Again, I'd say 20 psi is safe. Don't bother with nitrous!

 

Do you have a performance advisor? Did you talk to the person that help you build your engine? If so what did they say that you should do?

 

your motor is build but you need EMS i prefer AEM ems.
If you are planning to use greddy emanage or any afc II,neo...
at 20psi then good luck.

 

Everyone keeps stating that I own the Greddy Emanage.. But I do not. Oh btw I made the final verdict.