CTSC dyno

[DrVolkl]

Just installed the latest CT engineering autorotor. Seems that the thing is almost too efficient as I'm making 9.39lbs of boost on what is considered a stock or "low boost" setup. We tried upping the fuel pressure, but as you can see I'm still a little lean from 6-7k.
It's putting down some good power tho...

This is a '91 NSX with 78k miles, Cantrell headers, high flow cats and an ark (soon to be gtlw) exhaust.

Comptech is sourcing me a larger pulley for the moment to get the boost down...since once the temps around here drop, I'll probably be making 10-11lbs.

I'm also trying to see if I should just get an AEM and some injectors to solve the problem. The car pulls really hard...I love it.

Any thoughts would be appreciated.

 

[tjobeid]

That's weird , my friend with an 02 nsx has dc headers ,comptech exhaust and ctsc and he is getting the same results as you. But shouldn't he be getting a little more power?

 

[NSXkkk]

so u probably have 380 HP on engine??
the boost 9.39 is in psi??

 

[DrVolkl]

so u probably have 380 HP on engine??
the boost 9.39 is in psi??

A 15% loss is about 400 crank horsepower...but anyhow, this system should be 7-8...not 9+.

This is my first FI car, so I'm pretty new at all of this. Trying to figure out the best route to take now.

 

[nathan]

A 15% loss is about 400 crank horsepower...but anyhow, this system should be 7-8...not 9+.

This is my first FI car, so I'm pretty new at all of this. Trying to figure out the best route to take now.

With the previous CTSC autorotor that was released you should be seeing around 7psi on boost. I cant imagine that would change with the recent CT Engineering re-released kits. In my opinion, I think your system is running too much boost, and you are running too lean there. I dont like seeing my A/F in the 12s and definitely not in the 13s, which is where yours seems to be for now. Perhaps you should call CT Engineering, and send them these graphs.

I would have someone look at that right away. Your A/F is just way too lean, in my opinion, which is probably a direct result of your charger producing too much boost.

 

[DrVolkl]

Yeah, well I'm talking to them now and as it stands, we're trying to source a larger pulley to get the boost down.

But how about just getting an AEM and larger injectors? Would that do it?

 

[ChitownNSX]

With the previous CTSC autorotor that was released you should be seeing around 7psi on boost. I cant imagine that would change with the recent CT Engineering re-released kits. In my opinion, I think your system is running too much boost, and you are running too lean there. I dont like seeing my A/F in the 12s and definitely not in the 13s, which is where yours seems to be for now. Perhaps you should call CT Engineering, and send them these graphs.

I would have someone look at that right away. Your A/F is just way too lean, in my opinion, which is probably a direct result of your charger producing too much boost.

He already said he did that and they are sending sourcing him a larger pully to bring boost down. :redface:

Edit.. Guess I was a little late on the reply!

 

[Deltron Zero]

Y
But how about just getting an AEM and larger injectors? Would that do it?

Could you pass emissions in Seattle with this mock high boost setup? Does that matter to you?

 

[nathan]

He already said he did that and they are sending sourcing him a larger pully to bring boost down. :redface:

Edit.. Guess I was a little late on the reply!

Haha, yeah I definitely missed that when reading his first post.
But he did already point that out to me.

Dr. Volkl, be sure to get up some new graphs after you have swapped out the new, larger pulley.

Nathan

 

[ffffanman]

Nice numbers, remember Lean means more H.P. = Boom!
Not sure on how the new system fuels for boost with the autorotor, but.....
Maybe your stock fuel pump needs replacing.
Did you install a fuel pressure gauge on your fuel filter or somewhere?
Do you know what you should be at at idle and at boost.
Did you clean your injectors?
You obviously don't have enough fuel.
Just thinking out loud.
If Zan installed it, they know what they are doing I would think.....
I thought C.T Eng. redesigned this kit so there was no problem like this.
The initial Comptech I heard where tuned at sea level in hot air and things changed as the kits went out across the nation.
I am very interested in this.
Of course slowing things down with a large pulley on the Autorotor will help, but something else might be wrong, is what I'm thinking.
Do you hear a little detonation when you put your foot suddenly into it?

An Aem with proper accessories would of course be your best bet.
No question there.
Just the Money and Time.
Trev

 

[DrVolkl]

Could you pass emissions in Seattle with this mock high boost setup? Does that matter to you?

Yeah, emissions shouldn't be a problem at all, especially being obd1.

I don't know why it's making over 9lbs of boost... we've been messing with the fuel pressure regulator to try and get it more gas to stop the lean...but I don't think my stock injectors can handle it, let alone the stock ecu.

Think of it this way, a 9.3lb system was considered high boost on the old setup...and I'm running what should be a "low boost" setup.

So, would it be wise to just park the car for now?

Could I simply buy larger injectors, or would that not do anything with a stock ecu?

I don't mind going with the AEM...just add it to the tab I guess.

I'm not hearing any detonation as it stands...but if the temp starts to drop around here (which is will come Sept/Oct) you can bet my boost is going to creep up into the 10 range. Yikes.

 

[nathan]

Yeah, emissions shouldn't be a problem at all, especially being obd1.

I don't know why it's making over 9lbs of boost... we've been messing with the fuel pressure regulator to try and get it more gas to stop the lean...but I don't think my stock injectors can handle it, let alone the stock ecu.

Think of it this way, a 9.3lb system was considered high boost on the old setup...and I'm running what should be a "low boost" setup.

So, would it be wise to just park the car for now?

Could I simply buy larger injectors, or would that not do anything with a stock ecu?

I don't mind going with the AEM...just add it to the tab I guess.

I'm not hearing any detonation as it stands...but if the temp starts to drop around here (which is will come Sept/Oct) you can bet my boost is going to creep up into the 10 range. Yikes.

Honestly, to be safe. I would park the car, and wait for the larger pulley. Then install the pulley and see what results you get from there.

I would be concerned about fuel delivery though. But, given the fact that you are running too much boost, this will account for the lower fuel delivery. So, again waiting for the larger pulley would be a good choice for now. Then see what she runs with the larger pulley installed, and report back to CT.

I am rather confused though, why your kit is building so much more boost. What did CT say about this?

It is reasons like this that I am glad I bought the LoveFab budget kit (mindless plug :biggrin: )

Please keep us informed.

 

[ffffanman]

I guess the thing here is that your lean.
Too much air.
Not enough fuel.
Why do you have so much air if its not designed to do that much?
Not sure, maybe you don't really, maybe the boost gauge is off.
Substitute said gauge with another. Maybe this is a red herring. Ummm! Herring!
Pick up a 18 dollar fistpower boost gauge and double check.

Why do you have not enough fuel?
Worn out fuel pump.....?
Dirty injectors???
Just thinking again.

The Whipple high boost system came with bigger injectors (340cc I think) smaller pulley and a different rising rate fuel pressure regulator, cause with out the different RRFPR, you would flood your engine at idle. So unless you get all that and its tuned to your version of SC, then its useless. Go AEM or find out whats going on here.
I think you need to find out what your pump is doing.
Trev

 

[Deltron Zero]

I don't mind going with the AEM...just add it to the tab I guess.

Are you sure about that? I think there are some major benefits to staying with the OE ECU. Is this a daily driver for you? Do you really need the additional boost?

maybe the boost gauge is off.

I don't know. That's quite a bit of power for the normal amount of boost. Of course, maybe those numbers are off too!

 

[omega2]

When I had mine installed, I had my fuel injectors serviced by RC engineering and a new fuel pump installed (Walbro). As far as the higher boost, I would measure the pulley diameter. If you go with the AEM, then you should get larger injectors and a new fuel pressure regulator. But it might be safer and easier to lower the boost levels.

 

[TURBO2GO]

I peak at 6.066 PSI. My AFR's peaks at 11.11. How can there be so much difference?

 

[warren1205]

elev, temp, miles,

 

[Semnos_NSX]

TURBO2GO, I have to agree with you, that HP number seems very low if he was running 9.39lbs of boost. You’re running ~6.00lbs and seeing 361.2 HP and I’m running ~7.00lbs and seeing 372.1 HP. Something doesn’t seem right there

 

[DrVolkl]

Thanks for all the thoughts Trev, appreciate it.

Well, for one, you guys have a 3.2l motor, I don't.

(assuming you both do, I know at least one of you does.. :smile

I'm also running lean...so imagine if I had more fuel going in there...I'd be putting down even more power.

Also, mine dyno graph is .97% SAE corrected. Some dynos don't do any correction...I can't tell what yours is since it just says "Standard".

But again, the biggest difference is a 3.0 engine versus a 3.2

 

[zahntech]

All the Autorotor kits in the seattle area are making 9+psi out of the box.

Is this a problem?...Yes! Are Nate at CT and I working on it?....Yes


One Seattle car recorded on a sub 50deg day 12psi!!


Why?....altitude? air density? who knows...but the kit was never designed for that level of boost.

As for this car, the fuel pressure is maxed out and is at a level that is to be expected from a stock pump...9.3psi is just too much for this set up.

CT is sending me a larger pully to bring the boost back down to 7-8psi max, when I get it and it is installed further dyno testing will be done and the results posted.

As for HP?....11.5 to 12.2 A/F is far more important to me. and keep in mind that this is a 3.0L motor NOT a 3.2 so 360-370 HP is unrealistic.

I should have the new pully in this next week..stay tuned! :smile:

 

[DrVolkl]

I'm going to miss the extra hp! I wish there was a way to have both on the stock ecu.

The car drives so awesome right now...

 

[TURBO2GO]

TURBO2GO, I have to agree with you, that HP number seems very low if he was running 9.39lbs of boost. You’re running ~6.00lbs and seeing 361.2 HP and I’m running ~7.00lbs and seeing 372.1 HP. Something doesn’t seem right there

I don't think his HP level is low, in fact it is very good. My car has dyno'ed anywhere from 318 to 393 depending on the freakin' dyno. So inaccurate these things. Anyway the 362 figure is off the dyno that was used pre-CTSC/Exhaust install that posted 249.

I don't understand how I am only getting 6 lbs of boost and others getting 9+? Its the same pulley and same SC. Not sure what being a 3.2 instead of 3.0 has to do with it. I am practically at sea level.

 

[nsxotic911]

TURBO2GO, I have to agree with you, that HP number seems very low if he was running 9.39lbs of boost. You’re running ~6.00lbs and seeing 361.2 HP and I’m running ~7.00lbs and seeing 372.1 HP. Something doesn’t seem right there

Those are good numbers. I made 370RWHP+ with 7.0 lbs of boost.

 

[DDozier]

I'm going to miss the extra hp! I wish there was a way to have both on the stock ecu.

The car drives so awesome right now...

There is, larger injectors and an AEM F/IC.

Another thing about boost, back-pressure has a direct link to intake presure, you can not push in what you can not push out. You said earlier that you had Hi-Flow cats, you could put in a set of test pipes to see if it makes any difference.

By the way if you go the AEM F/IC route I have a set of Hi-Boost 330cc injectors already cleaned by RC if you need them, but they still may not be enough. If you change injectors you should be looking at 550cc injectors. If you decide not to go the F/IC or ECU I have all the pieces from my original Hi-Boost setup, I can send them for you to try the RRFPR. Also change your fuel filter if it is over a year old. I have seen fairly large changes in fuel pump performance having to push through dirty filters.

Look into the AEM F/IC I think you will like what you find and it has an added bonus of getting rid of the boost-a-pump if they are still using that on the new kit.

send me a PM if I can help.

Dave

 

[ffffanman]

Dave, I'll take your whipple high boost pulley if your selling it one day.
I have the low boost 3.0 litre pulley and low boost 3.2 litre pulley so far.
Ed gave me his high boost injectors and high boost RRFPR to Borrow.
Just need the pulley.
I can run the 3.2 pulley cautiously for now by cranking up the RRFPR and with my 9.6 Compression and what not.
I will install the rest this week hopefully.
Let me know
Trev