I think I will hit the TAG dyno too. I know the previous owner of my kit hit 250WHP at 8PSi, so I should be around that.
-John
I think I will hit the TAG dyno too. I know the previous owner of my kit hit 250WHP at 8PSi, so I should be around that.
-John
I am sure that your results were affected by your snow tires. The softer grooved tires definitely affect results. Go back there with your summer fronts on and I am willing to bet you make at least a minimum of 20 hp more. I have $20 to back my statement. Anybody want to bet? Furthermore, you put the intake on and then dynoed. The computer takes time to reset, learn and adjust mapping for the new intake.
i just smoked a 300C with HEMI yesterday, lol....that guy was totally pissed.
I assume that you are refering to the tires.
I am basing this on my experience with motorcycle racing. The National series abides by a dyno enforced hp cap. Therefore we dyno quite a fair bit to get as close as we can to the limit without going over (we also use a dyno jet dyno). The performance (summer) tires we use are either slicks or dots that resemble slicks with a couple of minimal grooves to meet the dot standard. We also use rains (similar to winters) which are very soft and have lots of groves and tread depth. The slicks/dots connect with the drum and do not have much drive loss. The grooved rains loose traction and have drive loss due to their flexibility and constantly adjusting "footprint." Basicaly, there is something soft and mushy between the wheel and the dyno drum. Typically we see a difference of 10% loss with the rains. Some teams take advantage of this and map for more power in the rain knowing that they will still stay under the limit.
Snow tires are similar, therefore that explains my confidence in my statement.
I think the weight difference of steelies would offset any difference in the compound, and honestly in 4th gear with two widder tires with an lsd i can't see it making as much difference on a car as it would on a bike
The MS3 stock wheels and tires weigh 44.5 pounds each. I do not use steele winter wheels so I do not know what they weigh, but I would assume more depending on tire size and if you went with a 16'' or 17". I smell a bet coming lol. Let us meet up at the dyno on Saturday and find out who is right!
thats what i been told, use higher performence tire for the dyno and get closer reality numbers on wheel, anyway, theres only speed3 dyno done in this forum, theres really nothing to compare with. but hey, as long as we still get the power from the snail, we should be powerful enough. i should buy the AP this time.
Hmmmm... I was half debating bringing 2 summers and doing a before and after run for you guys. BUT... I stripped my tuner key in the fall... so screw that lol!
-John
if we fast fwd'd a month, i'd seriously head back to Tag w/ my summers on b/c both you guys sound pretty sure of yourselves. not to undermine you both but i'm gonna give Mel @ Tag a call tomorrow and run your theories by him as he's done a tonne of dynos on all kinds of cars, street & race. i'll let you know.
just spoke to Mel. you guys can take this for what it's worth but he agreed that the wheels would affect the results. he sounded pretty confident, no hummin n hawwin. i pressed him for some numbers and he said the weight of the wheels & tire tread can impact results by as much as 10WHP. that's significant, IMO. (fyi, SRI install before dyno wouldn't make a diff)
i'm goin back for sure w/ the summers. a few weeks before i do, i'm gonna post a Dyno Invite thread. what do you think?
Last edited by REZXPERT; 02-21-2008 at 10:58 AM. Reason: add info
Great idea, count me in. Btw, did he unhook the battery terminal to reset the ecu after mounting the intake? If not I have heard it takes at least 100km's of driving for the ECU to figure the new air fuel ratios. Was the tuner monitering the A/F ratios during the runs?
The Intake will take a bit to fully re-learn, as its a very adaptive ECU, and even with the tires, I cant seem to figure out why there would be a 40WHP difference between James and this car. Only way to REALLY tell is to throw them both on the dyno at the same day etc
-John
To bad your car wasnt out now James, for $30 it would be a fun test for sure.