Disappointing Dyno Runs Today

by **SC V6** » Fri Aug 22, 2003 7:19 am

yeah... Im kinda pissed... I ran 7 pounds perfect w\ no S-afc II settings on hi.. w\o a check engine light, then all of a sudden... after I have it tuned at a dyno (set at 12.1) the light comes on.. and now I think I may have blown it.... I don't get it?
Scott

by **jim@foreignaffairs** » Sat Aug 23, 2003 10:16 am

I think everyone is discovering how hard on motors dyno tuning can be. Running hard and hot really brings out problems like broken knock sensors. I am still happy with 7 psi on the SuperSolara. I am using the JPP exhaust and Supra injectors. I do like the idea a further fuel increases at the very top end, though Eric has run over 150 mph which has to mean fuel is getting in even with his stock fuel lines. Since Eric has the modifications to support more boost, and has been the best at documenting performance improvements, I would like to see him try 6 or 7 psi. Our fuel in Oregon is 92 octane, and I have had no problems and am quite satisfied, though a automatic tranny can shift less abruptly and may be more forgiving than manuals. An equalizer of sorts.

by **cdssolara** » Sat Aug 23, 2003 11:46 am

Jim,

Nice to see a post from you on this forum. Your expertise would be a big benefit to many people here.

by **SC V6** » Sat Aug 23, 2003 5:02 pm

Im going to get both of my knock sensors replaced because rumor has it that Stock knock sensors are flimsy.. so.. I will be getting those done this week... after that I should be set to go..
Ill keep everyone posted
later
Scott

p.s. its weird because my knock sensors would go off when I was not even more than 10% on the throttle.... I could floor it threw the gears and it wouldn't go off, but when I went slow it would.. im thinking the knock sensors are picking up noise from the supercharger.. so..
anyway
later

by **Guest** » Sat Aug 23, 2003 7:40 pm

Scott, I have also heard the theory that the knock sensors could be picking up sound from the supercharger. In a conversation I had today, I was told that one guy had success by slightly relocating the knock sensors. My only worry with that would be that if there really was a problem, would the knock sensors be able to pick up true early detonation.

I have also been told that the replacement sensors aren't as sensitive as the OE sensors. My experience would seem to bear this out.

by **cdssolara** » Sat Aug 23, 2003 8:04 pm

Anonymous wrote:Scott, I have also heard the theory that the knock sensors could be picking up sound from the supercharger. In a conversation I had today, I was told that one guy had success by slightly relocating the knock sensors. My only worry with that would be that if there really was a problem, would the knock sensors be able to pick up true early detonation.

I have also been told that the replacement sensors aren't as sensitive as the OE sensors. My experience would seem to bear this out.

I don't know why I'm not being logged in automatically, anymore. Anyway, that's my post.

by **Ragtop George** » Sat Aug 23, 2003 9:28 pm

Good to see you here Jim. Anybody what happened to the Camryman site?

George

by **cdssolara** » Sat Aug 23, 2003 10:06 pm

Ragtop George wrote:Good to see you here Jim. Anybody what happened to the Camryman site?

George

The administrator took it down for some upgrade/redesign work. He posted a notice a couple of weeks ago saying that it would be down for awhile.

by **shidosha01** » Thu Sep 18, 2003 4:45 am

cdssolara wrote:I brought my car in for a dynotune today. The shop I went to used a Dynojet. The best I could get was 246.1 fwhp and 242.1 ft-lbs. Not bad numbers, but considering that I just got Jim@ForeignAffairs heads installed along with a 7 psi pulley, I was pretty disappointed. Last year, with a 5.5 psi pulley and my current Apexi WS catback, I ran 246.6 fwhp and 232.9 ft-lb. This was also on a Dynojet, by the way, so I should be comparing apples to apples. At least I got some gain in the torque. Maybe that explains why the car feels stronger, even though the numbers don't back it up.

What I'm affraid to also tell you is that different dyno machines give different readings. I got mine dyno tuned on a Mustang Dynamometer. With a 6lbs. pulley and JP setup from the headers back I was cranking out 248.8WHP and 232.6ft lbs. of torque. I'll see what I can find about which machine gives you the most accurate horsepower reading. I think Raycarlo did some research on this. Raycarlo...care to share?

by **shidosha01** » Thu Sep 18, 2003 5:14 am

http://www.hondaswap.com/~pills/mustangvsdynojet.html

link should work.

its about a mustang dyno vs. dynojet

by **cdssolara** » Thu Sep 18, 2003 2:18 pm

I read an article in one of the tuner magazines several months ago that showed very different readings for the same car on different types of dynomometers. It seems like you'd have to go to the same dyno shop in order to see how much more power a particular mod had given you. The numbers, themselves, don't seem to mean much of anything, except as a ballpark figure.

As Jim @ ForeignAffairs said in his post, the dyno really puts a lot of stress on the car. I'm not going to do another dyno run until I know the car is truly ready for it. For me, that means having a new knock sensor, upgraded injectors, and headers.

by **JoeB** » Sat Sep 20, 2003 7:02 am

Rizal, I guess that explains why my dyno numbers were so close to yours. I was a little disappointed with my run of 242fwhp but was shocked by your number. According to that article, adding 10 to 15%, that would put your numbers between 273 and 286fwhp on a DYNOJET, Impressive! You should check it out sometime and see if it really does make that much difference. I bet there is a difference but that sounds a little high when looking at the numbers Eric pulled with his mods. Mine was run on a DYNOJET machine with the WinPEP software. -JoeB

by **shidosha01** » Wed Nov 26, 2003 6:11 pm

Scottv6 wrote:Im going to get both of my knock sensors replaced because rumor has it that Stock knock sensors are flimsy.. so.. I will be getting those done this week... after that I should be set to go..
Ill keep everyone posted
later
Scott

p.s. its weird because my knock sensors would go off when I was not even more than 10% on the throttle.... I could floor it threw the gears and it wouldn't go off, but when I went slow it would.. im thinking the knock sensors are picking up noise from the supercharger.. so..
anyway
later

I blew both my knock sensors the other day despite having mine tuned at another shop with the SAFC II. I've always used 94 octane since I switched to 6lbs. and that was 2 months ago. I'll keep everyone posted about these knock sensors. Hope it is true that the ones you buy to replace the blown ones are stronger.

by **EricSol** » Wed Nov 26, 2003 7:29 pm

Rizal, dosn't the Afc2 have a built in knock sensor monitor? I was very intrested in that feature it sure would be helpfull knowing whats going on in regards to timing and figuring out when the motor is detonating.

by **shidosha01** » Wed Nov 26, 2003 7:53 pm

EricSol wrote:Rizal, dosn't the Afc2 have a built in knock sensor monitor? I was very intrested in that feature it sure would be helpfull knowing whats going on in regards to timing and figuring out when the motor is detonating.

Yeah look forward to programing that feature. The guy at Curry's Auto told me he didnt know what the setting was for the knock sensor for our cars. But however... he told me I wasnt knocking according to the dyno graph. Line was smooth going all the way up to 5k. He assured me I wasnt knocking because there would be lines that squiggle up and down.

Well...
2 months later both knock sensors are blown and i'm P'oed about it!

Disappointing Dyno Runs Today

Re: Disappointing Dyno Runs Today

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