21 psi w/ 16* timing on 93
06-11-2009, 10:04 PM
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21 psi w/ 16* timing on 93 i check ed my log from a run tonight trying to get the boost controller working and i hit 21psi with 16* timing on 93 with no knock. a/f was 12.0-12.5, motor is an iron 8.1:1 compression. is it odd to not have any timing pulled? i usually run 110/93 mix but was going to try to stay at 15psi. saw a run on 21 and it all looked good. i checked the plugs and #7 had alittle melt edge slightly on the last thread. i know i was on the edge but anyone care to comment.i had straight 93 bp in it for gas. no alky.
06-11-2009, 11:45 PM
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im sure you could get away with it once or twice, but i definitely wouldn't push my luck with it very long if i were you. i have similar compression and yield similar "freedom", but it just makes no sense to risk it.
i usually will stop on pump around 14-15psi and i believe my timing is at 15-16*. I don't know what your setup is, but if its like mine, i'm at around 850rwhp at those levels, and for the limited use that will see on the street, it makes no sense to risk all that $$$$$ to save a few bucks. ask me how i know! then upwards of 20+psi, that's where the stupid power comes in, and doing that on 93 is just, not coo.
i usually will stop on pump around 14-15psi and i believe my timing is at 15-16*. I don't know what your setup is, but if its like mine, i'm at around 850rwhp at those levels, and for the limited use that will see on the street, it makes no sense to risk all that $$$$$ to save a few bucks. ask me how i know! then upwards of 20+psi, that's where the stupid power comes in, and doing that on 93 is just, not coo.
06-12-2009, 07:36 AM
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i show knock sometimes durning a burnout but never durning a run. im going to run straight 110 on 25psi next time. i think i should be good. hopefully with some alky too
i just thought id let people know. im sure my cylinder pressure was up their and hot. i have no sign of pushing water. coolant looks clean. only thing i did was O-ring the block. stock 6.0 heads with stock arp studs at 80lbs.
i just thought id let people know. im sure my cylinder pressure was up their and hot. i have no sign of pushing water. coolant looks clean. only thing i did was O-ring the block. stock 6.0 heads with stock arp studs at 80lbs.
06-12-2009, 11:39 AM
#6
That's not good at all...if your plans are 25 psi put some really good fuel like c16. 12.5 a/f is too lean!
As far as alky only I would only run 17-18 psi, again if there is a failure or problem you are flirting with trouble.
Be careful when you make changes, if you are going to try something new richen the car up, turn the timing down or run more octane then you need, or a combination of all.
Rebuild broken motors is not fun or cheap.
As far as alky only I would only run 17-18 psi, again if there is a failure or problem you are flirting with trouble.
Be careful when you make changes, if you are going to try something new richen the car up, turn the timing down or run more octane then you need, or a combination of all.
Rebuild broken motors is not fun or cheap.
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06-12-2009, 11:47 AM
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I ran 17-18 psi on 93 pump here and there with an 8:1 engine, was okay. I think 21 psi I'd run at least straight 110. I wouldn't run C16 in a lot of combos that aren't running 8 second mph to be honest.
06-12-2009, 02:46 PM
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not sure what hp im putting down. the car is 3600lbs with me hopefully, no a/c, interior looks stock. i forgot to ad, that i was running 16-17psi 115-12.0 a/f. i was setting up the boost controller. i somewhere left it in high boost which was 21.6 thats why it went lean. also to add, i have a twin walbro fuel system to a -8 line. im loosing fuel pressure. i think it is the T-fitting, i got a magnafuel y fitting coming with a -8 bulk head. im not sure on the hp but the car went 6.29 a 117 on 15 psi and stock shocks, pro kit with a 1.50 60', i m going to get the a/f in the low 11s, with 110 gas. im trying to get it in the 1.3 60' but the track i went to doesnt believe in prep. im switching from the 26x10 drag to a 28x12.5, its hard here cause i like going to the local track 10 minutes from me but its never preped.
06-12-2009, 05:14 PM
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I agree the timing may not be too much but the AFR needs to be lower at the least to keep it form detonating. Race fuel would give a little margin for error but 12.5:1 with pump is a little out of control.
06-13-2009, 03:05 AM
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Blower car. 7.8-8.0 CR 347 with F1R 6 spd. Nothing special I have No2 on the car, but haven't got enough fuel for that yet. Probably will be more boost once I get it a little more lined out and get the pulley setup the way I am trying to get it with remodeling the house I haven't really played with it in a few weeks. TR10's by the way.