Boosted but slower than stock!

[Dawgz]

ok i dont know what to do at this point, so ill see what you guys have to say. Heres the situation, I raced this IS 250 (2006) which is way heavy compared to the solara and also has about 204hp, raced it last nite. He pulled on my alot, i lost to the IS 250, we did a few runs and the results were all the same. Today i raced my friends 93 maxima and i pulled on him but not that much, didnt even beat him by a car length, and sometimes it was real hard to pull on him.

So we went back to the house and took off my CAI extension, and ran agian, this time every try, i pulled on him, but not by much, it was a improvement but not much.


I dont know whats up, i should have beat that IS250 by a car length or more dont you think? all these cars were stock except for mine.


My mods are: Trd Supercharger @ 3-4psi, Jim's Fuel mod, Torque Rod, Injen Intake + K&N Cone filter, Greddy EVO II Full CatBack, NGK Iridium Spark Plugs, Magnecore 8.5mm Spark Plug wires.


What could be the problem? o and the race with the IS 250 was last nite, i reset the ECU today in the morning before racing the 93 Maxima.

[unbalancedwood]

Well does it feel faster when your not racing?

Like shouldnt you know before you even start racing if its another 50-70hp???

[Dawgz]

it feels fast when im not racing of course, u can heaer the s\c whine and wat not but when i raced that maxima, i didnt beat it by like 2-3 cars, like i should have, it lookedl ike i was racing it while i was stock.

[Turbosolara]

you should able to beat IS250 which is a 8 sec car. do you have check engine light on? i would suggest you to use denso IK22 colder range spark plug...you will feel a great difference. also are all of your tune up are up to dated?

maybe clean up your throttle body and intake maniford would help?

[Dawgz]

I was searching the forum and found this thread...heres a quote from it

The detonation sensors are a piezo electric sensor that produce a voltage signal output when excited by sound or vibration, The resonant frequency of the piezo element is the frequency that the sensor will be the most sensitive too, and will produce the most voltage output with least amount sound or vibratory input at that frequency. These sensors do there job but are not a foolproof device and have manufacturing tolerances that will make them operate different from one sensor to the other.

I want to mention one more thing, my car before I did the ECU detonation sensor mod would drive like crap even without tripping the CEL because it thought it was detecting detonation, it would severely retard the ingition advance curve as preventative and protective measure is my estimation of what was happening. The car came alive after doing this mod and had better driveability even when not driving agressively.

When I did the mod at the ECU I did not know which connector was for which bank because I had lost that part of the wiring diagram. I only had the info for the ECU.

I disconnected both inputs to the ECU and then connected the two ECU inputs together in parallel. I did this by cutting and stripping back the wires.

Next I connect on of the inputs comming from the two sensors and test drove the car. My first guess was wrong and I got the symptoms that I was always experiencing. For testing purposes I tried leaving the sensors disconneted it almost immediatley tripped the CEL light. Then I connected the input from the other sensor and test drove the car and all was right for te first time.

I would take pictures and post them but I dont have the spare time, I suggest going to a local dealer and making friends with a mechanic and have him print you out the wiring connections to the ECU and do as I describe above.

heres the link to the thread


http://www.solaraguy.org/viewtopic.php? ... c&start=30




These guys were rewireing the ECU so it's knock sensor readings were from the front knock sensor, thinking its getting readings from the front and the back but in reality just the front.


Is this what i need to do?

[Akfahad]

^^^If you haven't blown a knock sensor then there's no need to do that mod.

I did it only after returning from the track and blowing the rear knock sensor; re-wired the ECU to run on both the front knock and no more CEL. I don't think this has anything to do with your issue.

[Dawgz]

so then whats up with my case, why is the car so slow?


and that guy "eric" said his knock sensors were making the ecu retard the timing but also werent setting off the CEL, could be my situation to, i do not have any CELs

[CamryOnBronze]

I really dont think it is anything with knock sensors, Im willing to bet it is something involving general or scheduled maintenance. Thats why it is important to make sure everything is in tip top shape before you boost a car.

[Paladin06Greg]

OK, first when was the last time you had a complete tune up?

How about a transmission service?

Engine coolant change?

What kind and octane fuel do you run?

Is it good or BS gas to save money?

When did you last clean your TB as part of the tune up metioned above?

How many miles on your car?

I see no indication from your mods that you have the ability to really tune your engine/fuel trims so with the mods you have you will see no real significant power gains.

I could go on and on but I think you get the point by now.

Good luck and remember if you want a fast car it's cost a lot more then simple bolt ons.

Good luck.

[Dawgz]

OK, first when was the last time you had a complete tune up? I got the car @ 44k, i havnt done a tune up since i have had it in my possesion

How about a transmission service? When we installed the S|C, we emptied the Tranny fluid and filled it with full synthetic.
Engine coolant change? Levels are in between high and low, havnt changed it yet.

What kind and octane fuel do you run? 93 octane

Is it good or BS gas to save money? no.
When did you last clean your TB as part of the tune up metioned above? It looks clean, there are little to no deposits.

How many miles on your car? 79k

I see no indication from your mods that you have the ability to really tune your engine/fuel trims so with the mods you have you will see no real significant power gains.

I could go on and on but I think you get the point by now.

Good luck and remember if you want a fast car it's cost a lot more then simple bolt ons.

Good luck.

Answered ur Q'ns, but i dont get why im slower than stock rite now but when i was actually stock, i was pretty fast (compared to other cars i ran with)

[Paladin06Greg]

Slower then stock when? When it had 44K on it?

OK, first when was the last time you had a complete tune up? I got the car @ 44k, i havnt done a tune up since i have had it in my possesion

How about a transmission service? When we installed the S|C, we emptied the Tranny fluid and filled it with full synthetic.
Engine coolant change? Levels are in between high and low, havnt changed it yet.

What kind and octane fuel do you run? 93 octane

Is it good or BS gas to save money? no.
When did you last clean your TB as part of the tune up metioned above? It looks clean, there are little to no deposits.

How many miles on your car? 79k

I see no indication from your mods that you have the ability to really tune your engine/fuel trims so with the mods you have you will see no real significant power gains.

I could go on and on but I think you get the point by now.

Good luck and remember if you want a fast car it's cost a lot more then simple bolt ons.

Good luck.

Answered ur Q'ns, but i dont get why im slower than stock rite now but when i was actually stock, i was pretty fast (compared to other cars i ran with)

[Dawgz]

Slower then stock when? When it had 44K on it?

OK, first when was the last time you had a complete tune up? I got the car @ 44k, i havnt done a tune up since i have had it in my possesion

How about a transmission service? When we installed the S|C, we emptied the Tranny fluid and filled it with full synthetic.
Engine coolant change? Levels are in between high and low, havnt changed it yet.

What kind and octane fuel do you run? 93 octane

Is it good or BS gas to save money? no.
When did you last clean your TB as part of the tune up metioned above? It looks clean, there are little to no deposits.

How many miles on your car? 79k

I see no indication from your mods that you have the ability to really tune your engine/fuel trims so with the mods you have you will see no real significant power gains.

I could go on and on but I think you get the point by now.

Good luck and remember if you want a fast car it's cost a lot more then simple bolt ons.

Good luck.

Answered ur Q'ns, but i dont get why im slower than stock rite now but when i was actually stock, i was pretty fast (compared to other cars i ran with)

SO what do you suggest i do?

[Paladin06Greg]

Get a complete tune up and diag.
Also keep in mind your car no longer has a fresh motor. It's good transportation but far from a race car.

Good luck.

[Dawgz]

will do, but also, for the tune up, ive done most of what a tune up does...Changed the fuel filter, new spark plugs, new spark plug wires, and a oil change (still have 1500 miles to go for my next oil change). The only thing that i think id need to do is change my coolant and the PCV Valve, COrrect? or is there more to a tune up?

[that1mexguy]

Dawg, i've aready told u what u need to do man, ur problem is not getting ur car tuned (note: getting it tuned is not the same as doing the 'average' tune up). I was pushing 137 whp before getting it tuned - w/the 6psi pulley.

Again, you cannot just put on a supercharger and other mods and expec to get immediate results, you need to tune it. Get it tuned, that is my recommendation. You had already asked, others have said it (some didn't mentioned it because it's common sense to get it tuned so I would think they knew u know this), stop digging so much for answers, start w/the basics. Go get it tuned - not the same as doing a tune up (i say it again to make sure u get it). Get it tuned and let us know what happens. (hey, u asked me to chime in didn't ya lol)