sinjen wrote:Just heard back, 10:1 afr on a gen 4 is perfect
Heard back from who?
Do you monitor the AFR yourself while driving (have you got a wideband fitted)? The AEM Uego doesn't read any lower/richer then 10:1!
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sinjen wrote:Just heard back, 10:1 afr on a gen 4 is perfect
QUOC2008 wrote:Odin_S wrote:QUOC2008 wrote:
I think u are misunderstanding what I mean full boost is around 4200rpm to 6500rpm but the turbo start building up or spooling up around 2700rpm that's what the dyno chart shows... I know its impossible for a big turbo to run full boost from 2700 to 6500rpm.
Ah i see, mine is building from say 3500rpm. But wants to go on passed the 7200rpm limit
7200rpm it must be a beast... mid to top end power 500bhp? Hehe.
Hows your idle rough
It's always hard to get a good balance for a street car but good on track.
tiff_lee wrote:sinjen wrote:Just heard back, 10:1 afr on a gen 4 is perfect
Heard back from who?
Do you monitor the AFR yourself while driving (have you got a wideband fitted)? The AEM Uego doesn't read any lower/richer then 10:1!
sinjen wrote:tiff_lee wrote:sinjen wrote:Just heard back, 10:1 afr on a gen 4 is perfect
Heard back from who?
Do you monitor the AFR yourself while driving (have you got a wideband fitted)? The AEM Uego doesn't read any lower/richer then 10:1!
Justin from Prime in the U.S. They're the guys who have done hundreds of gen 4 conversions over there, so they know their stuff. I run a wideband. Not sure about it being too rich, as I believe JimGTS runs into the 10's at wot on his gen 3 and he's running a stock ecu on what is widely regarded as a well setup car.
My understanding is that mid 11's to 12's at wot is only used on engines that have been precisely mapped for power, not necessarily for longevity.
UEGO reads 8.0:1 up to 20:1
Think I'll do a proper boost leak test though
tiff_lee wrote:sinjen wrote:tiff_lee wrote:
Heard back from who?
Do you monitor the AFR yourself while driving (have you got a wideband fitted)? The AEM Uego doesn't read any lower/richer then 10:1!
Justin from Prime in the U.S. They're the guys who have done hundreds of gen 4 conversions over there, so they know their stuff. I run a wideband. Not sure about it being too rich, as I believe JimGTS runs into the 10's at wot on his gen 3 and he's running a stock ecu on what is widely regarded as a well setup car.
My understanding is that mid 11's to 12's at wot is only used on engines that have been precisely mapped for power, not necessarily for longevity.
UEGO reads 8.0:1 up to 20:1
Think I'll do a proper boost leak test though
Ah I was referring to the regular Uego not the x-series one.
Now you say Prime in the U.S that's got me thinking as i'm sure i've read about something similar before. Are they recommending 10:1 because the fuel in the US is actually lower octane than in the UK? I've not got time to find any decent links right now but if you look at a like for like comparison the equivalent to 95 unleaded is 90/91 in the US. (Edit: I realise no one is running a turbo on 95 or I at least hope not, that was just for comparisons sake).
http://www.mocgb.net/forums/showthread. ... ne-grading
http://rennlist.com/forums/993-forum/27 ... ained.html
sinjen wrote:tiff_lee wrote:sinjen wrote:
Justin from Prime in the U.S. They're the guys who have done hundreds of gen 4 conversions over there, so they know their stuff. I run a wideband. Not sure about it being too rich, as I believe JimGTS runs into the 10's at wot on his gen 3 and he's running a stock ecu on what is widely regarded as a well setup car.
My understanding is that mid 11's to 12's at wot is only used on engines that have been precisely mapped for power, not necessarily for longevity.
UEGO reads 8.0:1 up to 20:1
Think I'll do a proper boost leak test though
Ah I was referring to the regular Uego not the x-series one.
Now you say Prime in the U.S that's got me thinking as i'm sure i've read about something similar before. Are they recommending 10:1 because the fuel in the US is actually lower octane than in the UK? I've not got time to find any decent links right now but if you look at a like for like comparison the equivalent to 95 unleaded is 90/91 in the US. (Edit: I realise no one is running a turbo on 95 or I at least hope not, that was just for comparisons sake).
http://www.mocgb.net/forums/showthread. ... ne-grading
http://rennlist.com/forums/993-forum/27 ... ained.html
No he's saying that on a Gen 4 you should see 10:1 at WOT at full boost, no mention on fuel used. I use 99ron everytime. The ecu hasn't been "cracked" either so the ecu maps are all the same.
tiff_lee wrote:I never said they run around on 95, in fact I explicitly stated that was an example. You clearly lack reading comprehension and don't want to entertain anything other than what Prime has told you so i'm out.
Driftlimits Performance wrote:Indeed all done! What a lovely car! A cosmos rev5 with a st215.
Big thanks to Paul Woods for making the wiring loom whilst I was on holiday! Of course it started on the first attempt.
We do though have a Rev limit at 6k rpm. It limits spark then trys to cut fuel. Unfortunately due to time constraints/ flights etc we didn't get to the bottom of it. I don't think it's related to the auto gearbox ecu. We thought it was related to the 2 speeds on the fuel pump control as they do switch but I think it's too high in the rev range. I'd like to try coil packs but then we're getting into process of elimination and spending money.
When it hits the limit we do get a code for fuel pump circuit or ecu. However I believe this to be consequence not cause of the issue.