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Z

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Discussion Starter #1
going to Dynospot racing in Mountain view to have my HKs AFR tunned on Monday. the guys at the shop tell me to go with 91 street pump gas and dont reset my ECU if I want real street A/F ratio.
Lagtime in other post recommended me to go with at least 50/50 mix with race fuel and reset my ECU so I dont get timing retart during tunning.
oh BTW its a dyno jet roller with air fan as source of air.

any input is appreciated..

Jonas
 
Z

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ok I just mixed 10 gallons of 100octan with 6 gallons of 91 octan.
reseted my ECU and drove home on low boost (14psi). have put on 50 miles since, am I ready for dyno tune?
 
C

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Good, you already changed the fuel. Reset your ECU, change your plugs, and tune A/F to 11.2 (on a wideband of course).

That's about all I know, hehe. Let me know how it goes !:)
 

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I'm not a genious myself,when it comes to A/F ratios but i have done some research and an ideal #'s would b around 11.8:1 - 12.6:1 at higher RPM's starting around 4000RPM and on. If u keep the ratio under 11.5:1 means u r running too rich and could loose some power.
Regards. Yasir
 
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Yasir,

I think that is more for a drag racing application. 11.2:1 would be a safe ratio for any application, most importantly top end pulls :D .
 
Z

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Discussion Starter #6
guys, please go read my above post "Dynoed my car today, got some questions..." my A/F was 13.5:1 before HKS AFR tune and 13.1:1 after 15% gain...too lean for comfort.

Jonas
 

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Zerosoul said:
ok I just mixed 10 gallons of 100octan with 6 gallons of 91 octan.
reseted my ECU and drove home on low boost (14psi). have put on 50 miles since, am I ready for dyno tune?
Why don't you use straight 100 octane unleaded to tune?
 

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I would just tune on straight 100 octane so when you are out on the street you don't just throw in a couple gallons of race fuel and then hopefully you have xxx gallons of 91 fuel and then you go and race with that...it is all very inconsistent unless you actually put 100 octane in a 5 gallon jug and put 91 octane in another 5 gallon jug and mix it together perfectly before you go out to race. I just don't like inconsistency.

I tuned my car with straight 100 octane and that is all I ever put in my tank.
There is never a question of do I really have this many gallons of 91 and this many gallons of 100 and is the 91 the same grade of 91 that I bought before at this different gas station and I wonder how it would do on the dyno compared to this other 91 gas on the dyno. I would just keep it consistent as possible if I were you especially when you are tuning a/f.
 
Z

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Discussion Starter #10
should of told me that earlier...oh well, I know what to do next time I get on the dyno than;)
I was told by Andi and couple of other experienced Supra member that 50/50 mix is good, as long as computer dont detact knock...but I guess pure 100Octan wouldnt hurt.
 
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Discussion Starter #13
I tested the car last night...EGT still shoots up to 750C at the end of 4th gear pull.:mad:


I did the 12V mode and had the BCC tunned in, no help. I dialed in more fuel but only to find my car jerking under hard sudden acceleration (maybe too much fuel?)
met another supra member from SJ, Richi, and he told me to have my ECU code read and check my stock MAF sensor for false signals. DO I need to go the dealer to read codes?

thanx guys...

Jonas
 
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