Dyno Results with JP Performance Headers & Exhaust, Fuel

[cdssolara]

I just got my headers and exhaust installed, along with non-turbo Supra injectors and a Walbro 190 lph fuel pump. I had it dynotuned, and on my last pull, we got 272.7 fwhp and 250.5 lb/ft. That's the good news. The bad news is that yet again, I'm getting a Check Engine light. When I drove it after the dyno runs, it was pretty much in "limp mode" with serious timing retard. Today, I mixed in some 100 octane gas, and it was like giving Popeye some spinach. The car is now a monster. It immediately got all it's power back, and later in the day the CE light went out.

So, I guess the knock sensors are OK even after setting off the CE light. Both of my knock sensors are replacements, by the way. Now, I have to figure out a way to get the car to run this way on 91 octane gas. I'm going to look into the Split Second fuel management unit that also allow for timing adjustment.

By the way, the injectors and fuel pump worked out great. Under acceleration, my A/F ratio stayed steady at about 11.5:1. I now have a Bosch wide band O2 sensor with a converter for an Autometer narrow band A/F ratio gauge. (Thanks, JoeB!) So now my A/F ratio gauge gives me a steady reading, rather than jumping all over the map.

[Vampire]

Cool, was the fuel pump a drop-in like Wraith said? I am going to order it as soon as I get some time. I'm also going to get the Split Second FTC and Bosch injectors. BTW, what pulley you running?

[Hsakuragi]

now u made me jealous, cuz i have headers, pulley, safc sitting in my garage but no use.

[cdssolara]

Cool, was the fuel pump a drop-in like Wraith said? I am going to order it as soon as I get some time. I'm also going to get the Split Second FTC and Bosch injectors. BTW, what pulley you running?

Yes, it was a drop in and required a few extra touches. It makes a little bit of a ringing sound but after the car gets going you don't notice it. I am using a 7 psi pulley. I also have the lower compression heads from Jim@ForeignAffairs.

[Ragtop George]

I am trying to remember CD, are you standard or auto transmission?

George

[SC V6]

also... is this about the same pump that URD is going to use? did it do the trick? does it still have more room to push more fuel if u were to run more boost?
later
Scott

[Hsakuragi]

what's ur budget total afterall?

[Ragtop George]

CD;

Answered my own question, you are 5 speed. Your dyno results are very similiar to Eric's before he did the heads and 7 PSI pulley. Do you think the heads and higher boost give any significant gain in power?

Thanks

George

[cdssolara]

CD;

Answered my own question, you are 5 speed. Your dyno results are very similiar to Eric's before he did the heads and 7 PSI pulley. Do you think the heads and higher boost give any significant gain in power?

Thanks

George

George,

No, I don't think that the heads and higher boost give any more power. Eric got virtually the same numbers that I have with 5.5 psi of boost and some timing adjustments. I believe that he had to add higher octane gas to bring the overall octane of his fuel well above 91 octane CA pump gas in order to keep from setting off his knock sensors. Once he went to Jim's heads, he lost power and had to go to 7 psi of boost in order to get back to where he was before. The benefit is that he can now use 91 octane gas to do it.

I have almost the same set-up as Eric, except that I'm using an S-AFC for fuel management and he's using Split Second for fuel and timing adjustments. I also have Jim's heads, but they don't seem to be allowing me to use 91 octane gas. I'm not sure yet if I just have some low rpm pinging, which should be fixable with a timing adjustment, or if I'm going to have to go back to 5.5 psi of boost. I want to discuss this with Jim, because the whole point of getting his heads was to safely run more boost.

[cdssolara]

also... is this about the same pump that URD is going to use? did it do the trick? does it still have more room to push more fuel if u were to run more boost?
later
Scott

Scott,

No, this isn't the same thing that URD is using. He (Gadget) is including something called a Boost-a-Pump in his kit, which upgrades the power of the fuel pressure regulator. It's kind of a stop-gap measure to provide more fuel. The pump that I had installed is for an older Mustang. I found out about it on the Camryman forum from Wraith. He's a long-time contributor on various forums, who's has done some major turbo upgrades to his old Camry. He seems to really know his stuff. Anyway, this pump seems to work fine, although it's a little noisy. I'll post the part number in a later post. The particular pump I'm using is a 190 lph model, but they've got another one that puts out 250 lph. This one is fine with me, because I'm not really interested in taking this car any farther. Maybe if it was RWD....

[cdssolara]

what's ur budget total afterall?

Do you mean for the headers and exhaust or for everything I've done for the car?

The headers and exhaust were around $2000, and the install was just under $500. I also had the injectors and fuel pump installed, as well as replacing a knock sensor and valve cover gasket. I also had a wide band O2 sensor installed, as well as a converter to allow the output signal to be read by a narrow band A/F gauge, so the total cost was somewhat higher.

This is all in addition to the lower compression heads I bought from Jim @ Foreign Affairs last summer, and the cost of driving up to Portland and having him install them. So, yes, the cost is getting up there.

[shidosha01]

I've always been curious as to why Jim@Foreign Affairs hasn't posted dyno numbers ever since he upgraded to low comp. heads and more boost. If you're gonna sell a $2000 upgrade there should at least be dyno proven results like JP Performance.

[Hsakuragi]

He install that for you for free? If ya, it's worth enough to drive up there, since it's only like 7 hours or driving = about the same to LA

I going down to see Eric Sol at March, so he can take a look of the headers.

There is no charger of labor to change the injectors and the 02 sensors?

[cdssolara]

He install that for you for free? If ya, it's worth enough to drive up there, since it's only like 7 hours or driving = about the same to LA

I going down to see Eric Sol at March, so he can take a look of the headers.

There is no charger of labor to change the injectors and the 02 sensors?

Nothing is for free. I didn't mean to suggest that the installation of the injectors of O2 sensor was free. Those definitely had some cost associated with them. I only posted the cost of the headers and installation since that's what I thought you were looking for.

Jim hardly did the installation of the heads for free. That was almost a $2000 job, in addition to the cost of the heads, themselves. That included a few extra things, like replacement of a knock sensor and switching intakes. The cost of the job would be a little less if he just did a straight installation. Still, his hourly rate is less than what people generally charge in the Bay Area, so I thought it was worth the drive, especially since the Pacific NW is such a beautiful place in the summer.

The drive to Portland is almost 200 miles longer than going to LA, so unless you don't stop at all, you better figure more like 9 hours.

[cdssolara]

I've always been curious as to why Jim@Foreign Affairs hasn't posted dyno numbers ever since he upgraded to low comp. heads and more boost. If you're gonna sell a $2000 upgrade there should at least be dyno proven results like JP Performance.

That's a really good point. Ericsol and I have talked about that, too. When I was up in Portland, I asked Jim if he'd ever dynoed his car after all his upgrades. He said that he'd been too busy, but that he'd get around to it at some point. I still don't think he's done it. I think part of it is that he feels dyno runs are really hard on the car. I'd have to agree with him on that.

Conceptually, the idea of reducing compression makes a lot of sense. I'm hoping that I'll still be able to work out my problem, especially since Eric is still running 7 psi of boost with those heads using CA pump gas. I'll keep everyone posted.