recently a friend of mine was having some trouble with his 8, Lost of power issue. He has the level 2 RB flash and a fresh engine with approx 5K on it.
I hooked up my dude logger and his grams per sec was 211 @ 8.8k
which is ok.
My question is his a/f's NEVER got any richer than 13.8 and I could not identify the area in which the apv's open. Maybe RB tuned that out--I dont know.
But my question is ---is 13.8 a/f from 6.5K up an ok a/f for a na engine with no cat?
OD

 

Ok-----no opinions?
OD

 

I would think it would be okay....But not ideal. I don't think it would damage anything though.

 

whats the timing look like?

 

From everything that I've heard, thats a bit lean. I would think it would be in the 13.0 - 13.5 AFR area.

 

- it could give problems, be careful

 

the fact that it basically doesnt change from 6K and beyound is what concerns me..... ??? But I am not an expert with this 10-1 motor, 13.8 a/f
and timing is at 30degrees starting at 7K.
Just seems to be flirting with problems to me???
OD

 

No.

 

put it this way- is it knocking?

 

I dont remeber which flash he had, but L337fpc had a RB flash for his ported motor and his afr's were 14's all the way to redline!

 

I ran the rb flash v2 and saw .90-.91 lamda (13.3 afr)with timing up to 34 degrees wot.

 

thats not even the bad part.
Many times he is at 14.2---14.1 range --even at 6K and wot--got rich er at about 7.5K.
I am suggesting strongly that he needs to explore this a little.
His engine has a tendency to run a little hot also.--hmmmm???
OD

 

[QUOTE=olddragger;3752486]Ok-----no opinions?
[\quote]

You wouldn't listen any way. I give up. You will never search. Ever.

 

woah - that's too lean for my liking. At most 13.2 for a NA is what to shoot for, if you know your fuel system is up to snuff.

 

Team---never use the word never.
Besides you dont know if I searched or not. Yes I did search--and I couldnt find in all the hundred of pages that i went through any definate answers to my oridginal question. Lots of maybes.
Even RB themselves said it was ok--even the 14.1--14.2 until 6.5-7K at 100% load.
OD

 

I'd like to see a data log, if you could get one, of the calculated load and afr and rpm. Looks like this setup would generate a ton of heat from excessive exhaust gas temps. This is on a stock fuel pump? That scares the heck out of me. I guess it is hard to get a NA Renesis to detonate, eh?

 

he is having trouble with engine temps--really. And he has upgraded cooling mods--pump- good radiator etc.
her is a screen shot
http://garx8club.com/v3/download/file.php?id=2796

http://garx8club.com/v3/download/file.php?id=2797

Sorry--these files are too big to post here.
od

 

I wouldn't worry about it as long as you're not knocking. expect a reduction in cat life though.

the timing sounds like it's still stock.

 

I'm not surprised he's having issues with engine temperatures. The leaner your air/fuel mixture the higher your EGT's go. I wouldn't be surprised if he was seeing EGT's well above 2000 degrees. At some point that will cause problems with engine temperature.

One batch of bad gas and that could result in a problem.

If this is a friend of yours Denny, I'd tell him to ditch the off-the-shelf tunes offered by RB and get himself a custom tune for his car.

 

Back in 2007 after I made some mods I was running low - high 14s for quite a while on a custom Cobb beta tune. That's why I requested them to adjust itdown to the low-mid 13s on the Dyno when I had an event at Miller Motorsports Park, which dropped peak power by several hp and ran the 220 rwhp Dyno .....

 

Thanks Guys
It going to be hard to get him to change anything for the next 2 months as he is going to win the TTD NASA SE championship,---if his car holds together. Thank God for colder weather
The track events that he has left to do should have a high ambient in the 60's--this w/e at CMP and it will be long john weather and the last one at Road Atlanta in December.

He never runs a cat.
I also warned him of the radiate heat being sent to his trans via that close exhaust pipe---advised heat shield----he didnt do---now has grinding in second gear----sigh. Plus he is running BG synchroshift oil---its a damn good oil but it is a little lower viscosity.
Best I have found is 2 quart redline MT 90 and 1 quart BG mixed and then fill the trans.
OD

 

Redline released a new trans oil recently; MT85, sort of a half way gap between MTL and MT90. I still prefer Heavy Shockproof for non-street use .... This time around I did keep the cat out in the OE position with an aftermarket blanket shield for trans & wiring protection. The trans generates enough heat on it's own. No need to further compound the issue.

Wrt your original question, should of added that I also used higher than street fuel octane rating. Also ran the high dollar metallic cat without issue too. I think that running WOT AFRs in the 14s for an NA Renesis is ultimately only going to add stress and wear on the combustion sealing internals. More of a longer term issue than a short term catastrophic failure.



.

 

totally agree. If he can keep his temps under control --which with the cooler weather I think they may be OK.
he is using race gas when available. You have to be careful of what track you are at before you buy their gas. Some of it I wouldnt put in my weed wacker. Road Atlanta has a good source, but CMP----ummmm no--fuel jugs to the rescue.
Shockproof---that stuff is too pretty to do a good job
OD

 

hmm. I dunno I have RB's ver 1 Flash and my temp never get pass 90 Celsius even when I push it hard @ Englishtown.

I know its not as nuts as Ver 2, just saying.

I have Knight Sports Radiator tho.

didn't check my AFR for a long time. maybe I should start doing it again.

 

yep--its a little cooler up there?
Since the weather has cooled in the south--not as much of a problem. CMP this w/e--high in the 50's.
OD