hey guys looking for a air intake temp gauge last night racing a wrx i start detonating at the end of 4th immediately let go of the gas and came to a stop car was still running good but i would like to buy one of these gauges so i know ahead of time when im reacing its limit?? anyone have any ideas and what temps motors start detonating?? im boosting around 16 to 17 psi (stock turbo)

dont flame on me i know that the top intercooler isnt any good after 14 but right now im broke rather be slow and have a running motor then win a race and be dead
TwEaK

 

Forget the top mount's limit.... i wouldn't think that pushing the stock turbo past 14psi was safe anyways. Wouldn't that be well out of its range?

Changing out the stock intercooler would help your intake temps by far, especially at that PSI. I say that the intercooler being inadequate is the reason for your detonation. if you would rather be slow and have a running motor than win a race and be dead... why are you pushing that psi on the stock cooler if you know its inadequate? If you dont have money, dont risk blowing the motor and get your boost back down man!

As for the intake temp gauge, im a Data wh0re so i say get it the more you know about whats going on with your car, the better.

 

Then why are you running 17psi on stock turbo? You are just feeding your engine heat.

Intake temps of around 70C (160F) would start to get me worried

 

There are more reasons than your IC that are causing your detonation...

You don't list your mods...... Have no idea what you can do with what you got....

HOWEVER at 17 PSI.... you'd better have the A/F ratio under 12... there is no way in hell the stock fuel system is going to be able to do that...... Even with an SAFC, you are WAY out of the realm of sanity thinking you are going to get away with it for very long....

ALSO... the timing needs to be WAY retarded at 17PSI... the Stock ECU in't going to be able to do it because the closed loop map in the ECU simply weasn't designed for it.......

At 17 PSI and above 60 MPH.... the Stock IC isn't getting any air into it anyway, the flow over the hood of the car has lifted over the scoop by that speed and more than likely, there is some aregument that a vaccume at scoop trying to pull hot air OUt of the car throught he IC at high speeds..... Your intake temps are probably over 200 degrees.... I'd be willing to bet closer to 300... My buddy with a 3rd gen pushing 15 PSI of boost is seeing 225 degree intake temps.... not good.

Hot intake air temps, not enough fuel for the air volume at 17PSI, and timing thats too far advanced is why you were detonating...

You must have a boost controller.... but i've never heard of a stock turbo putting out 17 PSI.... but you'd better crank down your boost before you blow that car to pieces....

Here's the deal on detonation and intake temps..... its not the air intake temperature that causes detonation.... its the temperature inside the cylinder.... as the air gets compressed inside the rotor housing, it heats up.. depending on the pressure in the combustion chamber, the density of the air charge, the octane rating of the gasoline and the fuel mixture, the detonation point is going to vary,,, however, its in the 600-700 degree range..... lower octane gases being more succeptable... that being said... the hotter the air charge entering the cylinder is.... the hotter that compressing it in the cylinder is going to make it!!

Better intercooling does two things...... it not only cools the air charge.... it makes it denser.... therefore, a charge entering the cylinder at 14PSI and 125 degrees will contain more molecules of air and fuel than the same 14PSI charge at 250 degrees..... this is how FMIC's can add 20+ horsepower

All that being said..... If you are tight for money...... an intake temperature gauge with the thermister probe is going to run you close to 200 bucks...... You can rig up a functional FMIC for around that, its not going to be pretty or very efficient.... but it will still kick the TMIC's ***.....

 

My EMS Intake Air Correction map retards timing by 10 degrees at 181F. Wonder how much the stock ECU compensates...

 

At 17psi you are beyond any good HP gains and you are just over heating the intake charge.

You are also detroying the turbo. The turbo wasn't made to spin that high and will destroy the bearings soon.

 

im not worried about killing the turbo i brought down the boost today to 1bar (14.7 psi) so far havent had any problems ill give you a list of my mods now but im wondering where can i get an air intake temp gauge????how much do they run?
THanks
TwEaK

Mods: Rebuilt Streetported motor 8k on rebuild,full stainless steel 3inch racing beat exhaust,walbro 255lph,720 secondarys,banzai racing intake,k&n air filter, ACT street strip clutch,Greedy Boost Gauge,Greddy EGT gauge,HKS Turbo Timer,APexi SAFC,TUrbonetics manual boost controller

and thats about all i can think of off the top of my head right now if i think of anything else ill post
TwEaK

 

Heard of Google? I got 53,000 hits for "intake air temp gauge".

 

ok.....

if you don't have that SAFC throttle input hooked up to the boost sensor instead of the TPS.. do that,,, and re-tune to add fuel as a factor of boost instead of throttle.

Second..... That EGT gauge..... What was it reading when you pinged the motor (egts are better for tuning than a intake air temp)

The autometer Sport Comp Intake Air temp gauge is listed at $205 at summit.

Cheapest on ebay right now is 185 bucks......

 

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/intake-temp-sensor-can-i-use-egt-212577/
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/air-intake-temp-sensor-201523/

 

http://www.testequipmentdepot.com/fl.../50series2.htm

 

i get around 700 celsius pushing it 8 any ideas??? about the air intake temp gauge i have a local friend who makes them for companys says hell make me one just gotta pay for the parts (wholesale) total of about $45
TwEaK

 

700 degrees C is 1292 F....Sounds like your exaust is leaking into the intake. humor

I thought we/they were talking about the temps before and after the intercooler....not exaust temps.

 

Here comes the grammer police. Please punctuate. It makes your posts a bit easier to swallow. Did you fail English class or somthing?

 

https://www.rx7club.com/login.php?a=...763&i=37419859

I took the fifth grade three times and passed english two out of the three. It was the other *stuff* that gave me a hard time.

 

Too bad grammer is spelt 'grammar'...nothing like a dumb cop.

 

Isn't 14.7psi still too much on the stock turbo? Doesn't matter what your mods are I thought anything past 13psi on the stock turbo was bad news and it wasn't doing anything for you anyways.

 

Stock turbo seals eat themselves extremely fast above 14 or 15 psi.
I wouldn't use a stock turbo above 11-12psi.