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401 / 427 TBI power. E85 power


StarquestRescue
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  • 2 months later...

I fixed the fuel pump issue with a walbro 255.

 

The injectors not flowing enough at idle and cruise was a dead time issue i fixed with a versafueler peak and hold injector driver.

 

Last year i thought it was odd that i had to run more positive afc correction than the math predicted with the 850 delphi at idle and cruise.

 

When i stepped up to a 1050 primary for my e85 project and it barely delivered more fuel at cruise and idle i thought what the frack?

 

So i picked up a used versafuler http://www.acceleronics.com/versafueler.htm and hit pay dirt. Went from plus 50 and still to lean on the afc, to 0 and just right. Seems the stock ecu does not like after market injectors. The fuel delivery is much more linear now, instead of progressively getting richer as the injector duty cycle increased.

 

I can run up to 8 injectors with this gadget. :D

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Current turbo is a 18g 05h 15* clip. Running strait e85. A lot more than that has changed since last year.

 

Boost is tailing off. I tried to bump it up half way through the pull but was a little late on the 307 run. Did manage to get similar boost at peak power vs last years 297/403. Never really got it leaned out enough either. The car likes 12-12.5 to pull clean on the e85.

 

307/360

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/Data%20logs/DSC02644.jpg

 

Last years 297/403 18g o5h

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/Data%20logs/DSC02132.jpg

 

307 /360 run

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/Data%20logs/307HP360TQDYNO.jpg

 

302 / 355 run

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/Data%20logs/302HP355TQ.jpg

 

Boost comparison to last years 297/403. I bumped it up about 5000 rpm. That is a 2-3 pound differance in the middle of the run, maybe more. I recalibrated the map sensor since last year because it seemed to be reading a pound or two low.

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/Data%20logs/Dynoboostcomparison.jpg

Edited by StarquestRescue
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Great numbers John, I love the ingenuity in your setups. That Versafueler is pretty interesting.

 

Where did those 43 ft-lbs go though? Seems like its not worth making 10 extra hp if your losing that much torque.

 

Can you elaborate more on what else changed between last years setup and this most recent?

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Some of the torque was lost to the clip, some to the boost tailing off in the middle of the pull, some to maybe the timing and lack of head porting? That higher torque was not really usable at that low off rpm anyway. In a run up through the gears i am above my old torque peak any way. I was a little disappointed, but i see untapped potential in the way peak power responded the boost increases. The injectors are maxing out and i get a big afr dip at about 90% that is harder to tune for than the old set up.

 

 

Old step up--------------- NEW SET UP

 

7-1 Silverlite---------------8-1 wiesco

 

Stock size ss valves------over size ss valves, stock seat bore

 

Ported head ---------------no porting

 

Race gas blend------------ E85

 

850/1400 injectors --------1050/1800 injectors driven off the versafueler.

 

18g 05h-----------------------18g 05h 15* clip

 

10* base timing----------------6* base timing

Edited by StarquestRescue
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  • 4 weeks later...

I figured i needed a little more fuel so i replaced the 1800 secondary with a 2000. Unexpectedly the fuel delivery is more linear past 85% duty cycle. I tested my fuel and it was dead on 85% ethanol.

 

I have been working with 2 stage mbc controlled by a rpm switch. Got it dialed in on the 4th run of the day, and ripped off a 12.78 @ 112.65. Air temp was about 50*. Hoosier 225/50/16 dr's

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/Data%20logs/DSC02652.jpg

 

The ideal was to bring the second stage in about the time the initial boost spike was about to drop. The setting may well be almost the same, i need to count how many clicks they are at.

 

This screen shot is labeled wrong. It should say dotted line is 14.40 @ 105

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/Data%20logs/1278boostvs144.jpg

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/Data%20logs/1278boost1-2shift.jpg

Edited by StarquestRescue
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  • 4 months later...

I have been working on some changes.

 

Mhi TD06 standard turbine in a turbo shop machined 05h sq housing. Replacing the surge prone clipped 05h

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/2012/DSC02775.jpg

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/2012/DSC02772.jpg

 

New 9" Aem dry flow filter. Replacing a dirty 6" unknown brand.

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/2012/DSC02792.jpg

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/2012/DSC02794.jpg

 

Shiny 2.25 Intercooling piping and 4" intercooler. Replacing a mix of stock and tep piping and tep spearco intercooler.

 

http://i237.photobucket.com/albums/ff45/StarquestRescue/2012/DSC02796.jpg

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DANG!!!! SQR, nice work. Is that with just the two injectors or with the third one active? Either way, solid for TBI for sure. The 06 hot side made a crazy difference.

 

BTW, what does your car weigh?

 

Thanks,

 

Lance

Edited by Lance_S
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To keep the boost from coming in to soon and causing compressor surge problems in street driving, I ended up with an ebc, with the sensor hose plumbed through a solenoid controlled by an rpm switch. So the sensor does not see pressure till the rpm switch opens the solenoid at 3500 rpm, after which the ebc takes over. I also added some external springs to raise the base boost pressure to 15 psi. Edited by StarquestRescue
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