***DYNO - Stock 4g63, fp 18g, 284whp/280wtq, MAFT***

[Whophlungpoo]

I am to sure where dyno posts go, and I am not allowed to post these in the fp 18g thread so I guess I will post them here and have the mods take care of the placement.


Engine: Bone Stock 4g63, stock Cams, Stock IM, Stock T/B


Mods: GT Manifold, fp 18g turbo, internal w/g, 3" exhaust no cat, 2.5" charge pipes, 750cc injectors, Walbro 190HP fuel pump, stock fuel lines, Stock ignition on 6 heat range plugs, and a 3" GM MAF.

Tuning with a MAF-T @ 14.5psi on pumpgas.

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We got it up to 300 hp, but it was knocking quite a bit. Definitely will invest in a water/meth kit, BKR7E's, and DSM Link, I just wanted to see how well this MAFT will tune along with this fp 18g.

The car was tuned by a great guy named Chad at shop in Kansas City, Missouri called Modified by KC Imports.


What are your guy's inputs?



Thanks

 

[JayRolla]

Jay, a maft DOES affect timing. Just as an SAFC does. It fools the ecu by showing a lower airflow number. The ecu goes to a map that corresponds to the airflow number it sees. The timing map is more aggresive for a lower airflow number.

You CAN run to the last airflow map with an SAFC/MAFT if you boost enough run enough airflow so that even the corrected value is at the last, lowest timing map. But still mid-throttle acceleration will see terribly high timing for anything over 650cc injectors.

I've done away with my maft because of this. I saw more timing than I was comfortable with even with PTE 650s dialed in. My 1000cc injectors would be terrible for pump gas considering the timing advance with just the maft installed. One really needs dsmlink or ecu+ or a standalone to control the whole timing curve at various flow levels to really tune out knock.

Or just run e85 and add even more timing!!!! I wont have knock issues anymore with the e85, so even if it does affect the timing It wont really madder. Only reason people have issues running safc with large injectors is because they are using the wrong fuel. E85 FTW!!!.

 

[Whophlungpoo]

Or just run e85 and add even more timing!!!! I wont have knock issues anymore with the e85, so even if it does affect the timing It wont really madder. Only reason people have issues running safc with large injectors is because they are using the wrong fuel. E85 FTW!!!.

Care to elaborate? Or point me in the direction of some good reading? Thanks.

 

[brute]

E85 is an Ethanol fuel, I'm sure if you just Google it, you can find some great results people have had all throughout the tuning world. The only foreseeable problems are fuel system requirements and E85 availability.

 

[Black_Bullet]

Or just run e85 and add even more timing!!!! I wont have knock issues anymore with the e85, so even if it does affect the timing It wont really madder. Only reason people have issues running safc with large injectors is because they are using the wrong fuel. E85 FTW!!!.

Im so jealous. I have hell trying to dial any good mid range timing on this car without knock with 20 psi + ...

 

[JayRolla]

Im so jealous. I have hell trying to dial any good mid range timing on this car without knock with 20 psi + ...

Sorry Bullet, hopefully it gets more available in your area. There was a gas station selling it at $1.96/g the other day. Man I cant wait till I switch.

 

[dsm-onster]

Water or alky or mix injection can allow one to run rediculously high timing numbers. No e-85 stations neccesary .

650s are about the limit with pumpgas and a safc or maft. 650s are also good for about 400whp. If you're pushing for more horsepower than that, then you need more injector and you ought to have better timing control than none at all. With or without alcohol.

 

[DSMsOwnYourV8]

Sorry Bullet, hopefully it gets more available in your area. There was a gas station selling it at $1.96/g the other day. Man I cant wait till I switch.

Which gas station in springs sells it? I'm looking to switch my car over soon once I upgrade my injectors.

 

[Black_Bullet]

Water or alky or mix injection can allow one to run rediculously high timing numbers. No e-85 stations neccesary .

Im not a big fan of meth or any other types of injection. Too much maintenance and thought put into it. Id rather just have a tank full of e85 and only have to think about whens the next time i need to get gas ... But im a bum like that.

 

[joe sobo]

very impressive

 

[Txtalon]

My friend is running a 80/20 mix on E-85 running on Fp green turbo @26lbs and 0 knock. Another option for those that dont want to totally convert.

Ohh and tuned with MaftII with no problems.

 

[firefightermdc]

good numbers..where does the 18 start to spool?

 

[Whophlungpoo]

good numbers..where does the 18 start to spool?

I can't remember, I would say ~3700 RPM. I took the car down for a clutch and another round of parts.

 

[92_6bolt_1290]

750cc injectors seem like overkill for even 20 psi...my gsx was running the stock injectors with a walbro 255 pump and aeromotive fpr with 18psi of boost from a small 16g

 

[Rob10_99]

Find this one on the wayback machine?

I don't know why anyone uses injectors smaller than 1000's really.