E85 DYNO Fueling Comparison 2.5 vs 2.8 (m62)
10-23-2013, 05:54 PM
#1
E85 DYNO M62 2.5 vs 2.8
Client wanted to dyno his LSJ
E85 / 60s / 50/50 7gph W/M injection on 2.5 pulley
Ported m62 - 2.8 and 2.5 used
zzp 3" CAI
Badmab shorty
ZZP 3"-2.5" catless DP with cutout and block off plate
zzp 2.5" catback
Unfortunately due to the dyno outside temps being 80-85* on the dyno and the stock intercooler system being insufficiently bled or simply insufficient, the IAT2 hit 160-170* F. every pull. Was hoping to show my client that his car can hit 300whp, and of course join the 300whp M62 club. It came close though...
http://www.youtube.com/watch?v=I0quT...ature=youtu.be
Please visit my 91 octane fueling myth thread for more information on WOT fueling using pump gasoline.
https://www.cobaltss.net/forums/dyno...s-fact-230350/
E85 / 60s / 50/50 7gph W/M injection on 2.5 pulley
Ported m62 - 2.8 and 2.5 used
zzp 3" CAI
Badmab shorty
ZZP 3"-2.5" catless DP with cutout and block off plate
zzp 2.5" catback
Unfortunately due to the dyno outside temps being 80-85* on the dyno and the stock intercooler system being insufficiently bled or simply insufficient, the IAT2 hit 160-170* F. every pull. Was hoping to show my client that his car can hit 300whp, and of course join the 300whp M62 club. It came close though...
http://www.youtube.com/watch?v=I0quT...ature=youtu.be
Please visit my 91 octane fueling myth thread for more information on WOT fueling using pump gasoline.
https://www.cobaltss.net/forums/dyno...s-fact-230350/
Last edited by 100% METH; 10-31-2013 at 04:22 PM.
Moderator
10-25-2013, 04:03 PM
#11
with the cooling issues sorted I have no doubts that 300whp on his budget header/dp combo would of been attainable.
Any LSJ/M62 can hit over 300whp with the following mod list, so long as IAT2 temps stay under 140* F. by redline.
M62/2.5 (ported blower helps)
Any exhaust combination works (BADMAB, midlength, long tube, 2.5 or 3" Dp and catback)
80s, e85
LS4 (stock tb works too)
Doesn't even really require pushing the tune that hard.
Why strain the blower and engine @ 20-22 PSI for only 300whp though?
16 psi yields an easy 275whp...
TVS at the same boost pressure would yield over 300whp on e85 and basic bolt ons.
Any LSJ/M62 can hit over 300whp with the following mod list, so long as IAT2 temps stay under 140* F. by redline.
M62/2.5 (ported blower helps)
Any exhaust combination works (BADMAB, midlength, long tube, 2.5 or 3" Dp and catback)
80s, e85
LS4 (stock tb works too)
Doesn't even really require pushing the tune that hard.
Why strain the blower and engine @ 20-22 PSI for only 300whp though?
16 psi yields an easy 275whp...
TVS at the same boost pressure would yield over 300whp on e85 and basic bolt ons.
10-25-2013, 04:59 PM
#12
It is still interesting to me that you gained power by going leaner on a blown LSJ. On the dyno I started really rich, around mid-low 10's and gained 16whp by leaning to 11.3-11.5. As I approached 11.8-9 I lost 2-3whp. However, there is a large flow difference between the M62 and TVS and other airflow factors such as my ported head, so the airflow characteristics vary quite a bit. Also curious, what heat range of plugs were in the car being tested?
10-25-2013, 06:32 PM
#13
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That just crushed my dreams of ever hitting 275-280 WHP without E85. I've got a ported head, Ported LIM, Single pass, and an LS4 throttle body on top of what your client has. Along with a much better cooling system than them. I'm also not using methanol injection. I have the kit but my unit that activates it is garbage.
I'm thinking of just giving up on the Cobalt and moving onto another car then...
I'm thinking of just giving up on the Cobalt and moving onto another car then...
10-25-2013, 11:37 PM
#15
It is still interesting to me that you gained power by going leaner on a blown LSJ. On the dyno I started really rich, around mid-low 10's and gained 16whp by leaning to 11.3-11.5. As I approached 11.8-9 I lost 2-3whp. However, there is a large flow difference between the M62 and TVS and other airflow factors such as my ported head, so the airflow characteristics vary quite a bit. Also curious, what heat range of plugs were in the car being tested?
I too was impressed by the jump from 10s to 11.5-11.6
10-28-2013, 05:57 PM
#16
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I could tune my car on 94 Oct + 10 GPH 100% methanol but I drive my car daily. All I really want is a car with a solid power-band. Right now I need to find parts that GM doesn't even make... I wish my car ran, period.
I will definitely make a new thread when I tune my car. I suppose I will be happy with 260 WHP because it's just a number. My goal is to run high 12's on slicks. No LSD though...
I see these new 5.0 Mustangs netting low 12's easily and it discourages me because I drive a Cobalt.
10-28-2013, 06:04 PM
#17
All I really need is a new controller. I would like to see if I can get a progressive controller. I know DevilsOwn sells them for about $150 brand new.
I could tune my car on 94 Oct + 10 GPH 100% methanol but I drive my car daily. All I really want is a car with a solid power-band. Right now I need to find parts that GM doesn't even make... I wish my car ran, period.
I will definitely make a new thread when I tune my car. I suppose I will be happy with 260 WHP because it's just a number. My goal is to run high 12's on slicks. No LSD though...
I see these new 5.0 Mustangs netting low 12's easily and it discourages me because I drive a Cobalt.
I could tune my car on 94 Oct + 10 GPH 100% methanol but I drive my car daily. All I really want is a car with a solid power-band. Right now I need to find parts that GM doesn't even make... I wish my car ran, period.
I will definitely make a new thread when I tune my car. I suppose I will be happy with 260 WHP because it's just a number. My goal is to run high 12's on slicks. No LSD though...
I see these new 5.0 Mustangs netting low 12's easily and it discourages me because I drive a Cobalt.
11-04-2013, 10:54 PM
#21
Senior Member
Some good info...I'm working on a e85 toon uh i mean tune. I know that ET trap method isn't the best judge of hp but i'm trapping 106-107 consistently with 2.85" Pulley,80s,cut air box, pacesetter (with the ball flange removed and 3" vband welded on) and a 2.5" cat-back. and cxr heat exchanger. 106 107 trap has to be in the ball park of 280-290whp. iat never go above 135, i think if you got your iats down 300 on a 2.5 with w/m injection on e85 should be doable.
on another note do you mind me asking what kind of timing you are running (i understand if you do ...business and all)past 5.8krpm i see knock with anything over 22* which i find odd because i was running 21 on 93oct.
on another note do you mind me asking what kind of timing you are running (i understand if you do ...business and all)past 5.8krpm i see knock with anything over 22* which i find odd because i was running 21 on 93oct.
11-07-2013, 02:02 AM
#22
a good stage 2 lsj can run high 12s with a good driver.
considering you only gained 10hp for pushing 6 more psi on a rediculously sized pulley its definately more worth running a 2.8. heck a 2.7 maybe. its gotta be cold enough for more pulls now!
2.5 sounds awesome though
considering you only gained 10hp for pushing 6 more psi on a rediculously sized pulley its definately more worth running a 2.8. heck a 2.7 maybe. its gotta be cold enough for more pulls now!
2.5 sounds awesome though
Last edited by riceburner; 11-07-2013 at 10:04 AM.
11-07-2013, 09:40 AM
#23
I am glad my stage 2 hub won't allow me to run smaller than a 2.7, because I'd have at least a 2.6 on there like I did with the TVS lol. 10whp and 15 ft/lbs is a nice gain in my book, and at the same AFR its more like 12whp and 16tq. Worth it for the temps? Maybe not, but makes for fun times.
