7MGE Dyno July 2017

SRZMK3

New Member
Authorized Seller
Joined
Jan 14, 2010
Messages
368
Likes
0
Location
Federal Way, Washington, United States
#1
All the basics, AFM 6teeth adjusted, 15* advanced 92 octane. Pacesetter header, Cold Air intake, 2.5inch exhaust going to a HKS hipower, cat delete, one piece steel driveshaft.

90% humidity on a very hot day in oregon, made a crapton of torque but i figure the mid day conditions didnt help my NA horsepower figures.

lemme know what you think,

160whp 230lbfttq
 

Attachments

te72

Classifieds Moderator
Staff member
Authorized Seller
Joined
Mar 26, 2006
Messages
6,602
Likes
0
Location
WHYoming
#3
Not bad! Making that much torque and having only 160hp seems odd though, is that a misprint?
 

suprarx7nut

YotaMD.com author
Authorized Seller
Joined
Nov 10, 2006
Messages
3,815
Likes
0
Location
Arizona
#4
Not bad! Making that much torque and having only 160hp seems odd though, is that a misprint?
The chart looks like the numbers are correct, but torque took a nose dive at the top end, which explains the low peak power figure. AFRs are also dangerously rich through most the test. I'd love to get more info on that run and setup. There are a few odd things about it - at least to my completely unfamiliar eye.

CRE's NA 7M definitely didn't feel like torque fell off like that!!
 

te72

Classifieds Moderator
Staff member
Authorized Seller
Joined
Mar 26, 2006
Messages
6,602
Likes
0
Location
WHYoming
#5
Hard for me to say, I prefer analyzing graphs plotted against rpm, rather than power against speed. That second one always seems weird to me.

Either way, looks like peak power is around 4000 rpm? That is really weird. OP, you say, "AFM 6teeth adjusted" and I'm not sure what you're referring to here. That may be why your AFR's are rich, tinkering with the AFM.
 

7MGTEsup

<i>Formerly 'Down but not out'</i>
Authorized Seller
Joined
Jun 14, 2005
Messages
614
Likes
0
Location
England
#6
The chart looks like the numbers are correct, but torque took a nose dive at the top end, which explains the low peak power figure. AFRs are also dangerously rich through most the test. I'd love to get more info on that run and setup. There are a few odd things about it - at least to my completely unfamiliar eye.

CRE's NA 7M definitely didn't feel like torque fell off like that!!
Can you have dangerously rich? Looks like the torque falls of as soon as it switches rich at 82mph if you could find a way to get that back up to around 13:1 you would recover a lot of that lost torque.
 

suprarx7nut

YotaMD.com author
Authorized Seller
Joined
Nov 10, 2006
Messages
3,815
Likes
0
Location
Arizona
#7
Can you have dangerously rich? Looks like the torque falls of as soon as it switches rich at 82mph if you could find a way to get that back up to around 13:1 you would recover a lot of that lost torque.
Lol, no, that was a typo. Dangerously lean. My bad!

Do you want to run 13:1 under load though? I thought 11.5:1 was about the end of safe AFRs under load.
 

3p141592654

90T
Authorized Seller
Contributor
Joined
Oct 11, 2005
Messages
3,829
Likes
7
Location
Thousand Oaks, CA
#8
I would also check that the ACIS system is working properly. I don't know much about it, but it seems that if its stuck in the low rpm mode it might cause rolloff at the high end.
 

te72

Classifieds Moderator
Staff member
Authorized Seller
Joined
Mar 26, 2006
Messages
6,602
Likes
0
Location
WHYoming
#9
Do you want to run 13:1 under load though? I thought 11.5:1 was about the end of safe AFRs under load.
I certainly wouldn't worry about it on an NA, if one were to start seeing excessively high EGT's, then there might be cause for concern. When my car was tuned, I was seeing AFR's between 11.5 and ~11.9 to one. Runs great and temps stay quite reasonable.

I would also check that the ACIS system is working properly. I don't know much about it, but it seems that if its stuck in the low rpm mode it might cause rolloff at the high end.
Ahh, good catch 3P! I forgot that the NA had the ACIS... The idea, in a nutshell, is that it has a longer intake runner for low rpm, and a shorter runner for high rpm. If I recall, the switch over point is something like 3800 rpm, which would correlate with my thinking the peak power appeared around 4k...
 

7MGTEsup

<i>Formerly 'Down but not out'</i>
Authorized Seller
Joined
Jun 14, 2005
Messages
614
Likes
0
Location
England
#10
Lol, no, that was a typo. Dangerously lean. My bad!

Do you want to run 13:1 under load though? I thought 11.5:1 was about the end of safe AFRs under load.
13:1 is a pretty reasonable target with an NA engine they don't require anywhere near as much enrichment as a turbo engine hell some more modern engines run 14.6:1 at wot.