stock shortblock+E85; how much timing?
05-23-2012, 04:49 PM
#1
stock shortblock+E85; how much timing? Getting my car tuned on Saturday and im looking to see what people have successfully run on on stock shortblocks.
The fuel has tested to 85% so thats what ill be on.
My biggest issue is im on stock headbolts, so i really want to know what i can realistically run without lifting them. (I8UR4RD lifted them at ~9psi/22* on pump/meth, so that kind of has me worried)
So far ive told my tuner i dont really want to go past 8-10psi/14-16*
Is that pretty safe on E85?
The fuel has tested to 85% so thats what ill be on.
My biggest issue is im on stock headbolts, so i really want to know what i can realistically run without lifting them. (I8UR4RD lifted them at ~9psi/22* on pump/meth, so that kind of has me worried)
So far ive told my tuner i dont really want to go past 8-10psi/14-16*
Is that pretty safe on E85?
05-23-2012, 09:32 PM
#5
yeah see thats where im stuck, idk how far to push it on stock head bolts right now.. Ill be putting in studs and ls9s once i get back from internship in august for sure though. im really gonna try and push this shortblock on E85 after that..
05-24-2012, 12:01 AM
#7
FormerVendor
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There are quite a few more factors than just max timing. Does your tuner have experience tuning E85 in LSx engines? If not, give me a call at the shop tomorrow and I'd be more than happy to go over a few things with you. (phone # in sig)
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05-24-2012, 11:12 AM
#9
My car is just about to hit 50k, but im not sure if the previous owner ever removed the heads. Thank you for the info!
05-24-2012, 11:49 AM
#10
Not that I am aware of.
There was some information regarding this elsewhere but it wasn't accurate.
Read them like a normal plug. It is hard to judge the fuel ring on a E85 fueled car because it burns very clean.
You have to watch the heat on the strap of the plug mainly to judge rich, lean, over or under timed.
I will say this. Adding timing and adding timing you can get carried away quickly and hurt parts, lift heads etc. because you are adding cylinder pressure without a way to judge it really.
If I were you I would leave the timing alone, OR even retard it some and run more boost.
There was some information regarding this elsewhere but it wasn't accurate.
Read them like a normal plug. It is hard to judge the fuel ring on a E85 fueled car because it burns very clean.
You have to watch the heat on the strap of the plug mainly to judge rich, lean, over or under timed.
I will say this. Adding timing and adding timing you can get carried away quickly and hurt parts, lift heads etc. because you are adding cylinder pressure without a way to judge it really.
If I were you I would leave the timing alone, OR even retard it some and run more boost.
05-24-2012, 12:13 PM
#11
Not that I am aware of.
There was some information regarding this elsewhere but it wasn't accurate.
Read them like a normal plug. It is hard to judge the fuel ring on a E85 fueled car because it burns very clean.
You have to watch the heat on the strap of the plug mainly to judge rich, lean, over or under timed.
I will say this. Adding timing and adding timing you can get carried away quickly and hurt parts, lift heads etc. because you are adding cylinder pressure without a way to judge it really.
If I were you I would leave the timing alone, OR even retard it some and run more boost.
There was some information regarding this elsewhere but it wasn't accurate.
Read them like a normal plug. It is hard to judge the fuel ring on a E85 fueled car because it burns very clean.
You have to watch the heat on the strap of the plug mainly to judge rich, lean, over or under timed.
I will say this. Adding timing and adding timing you can get carried away quickly and hurt parts, lift heads etc. because you are adding cylinder pressure without a way to judge it really.
If I were you I would leave the timing alone, OR even retard it some and run more boost.
And i was planning on the low timing/more boost to get what i want.
this is just an after thought, but do you normally see more of an increase in cylinder pressure from raising the boost by a lb or by raising the timing by a degree?
