Max whp on mp62 and stock motor. - LotusTalk - The Lotus Cars Community
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post #1 of 17 (permalink) Old 11-30-2017, 12:52 PM Thread Starter
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Max whp on mp62 and stock motor.

Hopefully my car gets dynoed next. Any guesses?
I have
Vf stage 2 kit with 3.0 pulley
Radium aem ems4 standalone with manifold pressure and temperature sensors.
DMC headers, decat, larini gt2 muffler
93 octane.

Will be tested on dynapack dyno.
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post #2 of 17 (permalink) Old 11-30-2017, 02:53 PM
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I think my Exige is around 300 crank, with BOE Torque 300 tune and all bells and whistles. I have 2.9" pulley.

I am saying it might be slightly north of 300 because I have port and polished my SC as well as my head.

I suppose the lightweight flywheel and the other improved kit don't impact power output although may make it feel more powerful?

I need to get a updated dyno pull to answer my own questions.

L O T U S
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post #3 of 17 (permalink) Old 11-30-2017, 03:02 PM
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281rwhp here with Blade 300, stock manifolds and cat on 91 octane (Dynojet on a warm SoCal day).

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post #4 of 17 (permalink) Old 11-30-2017, 03:33 PM
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257 here with Torque 300 tune and all add ons ons, roughly 90 degree day. Tires not inflated highly or any other tricks. Dynojet.

2007 Exige S with almost every track mod...
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post #5 of 17 (permalink) Old 11-30-2017, 04:16 PM
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Quote:
Originally Posted by kfennell View Post
257 here with Torque 300 tune and all add ons ons, roughly 90 degree day. Tires not inflated highly or any other tricks. Dynojet.
I've always done dyno pulls on normal tire pressure. WRX twice, C6 Corvette thrice, ZX10-R twice and Exige twice. I've never heard of highly inflated tires with regards to positive dyno numbers on any enthusiast site, let alone other tricks. Do tell as I'm curious.

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post #6 of 17 (permalink) Old 11-30-2017, 04:53 PM
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Quote:
Originally Posted by oldmansan View Post
I've always done dyno pulls on normal tire pressure. WRX twice, C6 Corvette thrice, ZX10-R twice and Exige twice. I've never heard of highly inflated tires with regards to positive dyno numbers on any enthusiast site, let alone other tricks. Do tell as I'm curious.

San
I believe it's lower pressure that can make more HP as you get a torque multiplier from the smaller OD, but conversely you can end up with the wheel spinning.

It's hard to imagine that you have 40 more HP then I do with the same setup, when I have had 2 motors have the same power, so one of us is wrong almost 100%

2007 Exige S with almost every track mod...
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post #7 of 17 (permalink) Old 11-30-2017, 05:35 PM
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Quote:
Originally Posted by kfennell View Post
I believe it's lower pressure that can make more HP as you get a torque multiplier from the smaller OD, but conversely you can end up with the wheel spinning.

It's hard to imagine that you have 40 more HP then I do with the same setup, when I have had 2 motors have the same power, so one of us is wrong almost 100%
Maybe just a math error... 281 - 257 = 40?

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post #8 of 17 (permalink) Old 11-30-2017, 05:43 PM
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254 whp; 169 Tq

...on whatever dyno that BOE uses.

Stock exhaust.

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS. Past '72 Elan Sprint (I restored), Lotus 7 w/X-flow, TT Supra, Bugeye Sprite, BMW 2002 & 2002tii, '65 GTO.

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post #9 of 17 (permalink) Old 11-30-2017, 05:53 PM
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Quote:
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Maybe just a math error... 281 - 257 = 40?
Doh for some reason I was thinking he said 300 when I wrote that, still a non zero difference. 24 HP.

2007 Exige S with almost every track mod...
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post #10 of 17 (permalink) Old 11-30-2017, 05:54 PM
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Quote:
Originally Posted by glb View Post
254 whp; 169 Tq

...on whatever dyno that BOE uses.

Stock exhaust.
That's not a MP62 though...

2007 Exige S with almost every track mod...
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post #11 of 17 (permalink) Old 11-30-2017, 05:57 PM
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Oh. I just thought MP62 was one of those gangs people are scared of.....
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05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS. Past '72 Elan Sprint (I restored), Lotus 7 w/X-flow, TT Supra, Bugeye Sprite, BMW 2002 & 2002tii, '65 GTO.

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post #12 of 17 (permalink) Old 11-30-2017, 07:59 PM
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Quote:
Originally Posted by kfennell View Post
I believe it's lower pressure that can make more HP as you get a torque multiplier from the smaller OD, but conversely you can end up with the wheel spinning.

It's hard to imagine that you have 40 more HP then I do with the same setup, when I have had 2 motors have the same power, so one of us is wrong almost 100%
Obviously your math is wrong.

Everyone knows individual dynos are just that, individual. That your numbers are different doesn't make either of us wrong.

You could look at my dyno plot on this site, but Photobucket kind of screwed that up. As far as the same setup, you have a completely different setup, they're not even similar.

Motard has a similar setup as mine, and makes nearly the same power. Jack has a similar setup (even the same Laminova configuration) with a Phil/Allen tune that makes over 300rwhp on the MP62.

You're free to question my output, but you're implying something fishy on my part. Not my style.

Allen at VSA did nearly all of my modifications, and works closely with Phil. I actually wanted more power with headers, Phil/Allen tune etc., but Allen advised I was at the point where more power would reduce the reliability. I respect his opinion. Jack is also Allen's customer and lives closer to him (damn you Jack).


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post #13 of 17 (permalink) Old 11-30-2017, 10:28 PM
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You simply cannot compare power on the internet with any reasonable degree of credibility...

The Lotus cars are particularly problematic because most of the tunes, stock, Sector's, VF's, etc are VERY sensitive to heat. They crank tons of timing into them and then allow the IAT compensations to pull the spark back out at track temps. So depending on how warm the air was during the pull can impact measured power in multiples of 10s! 10, 20, 30, 40, and 50 whp reductions are the result of temperature compensations in those tunes...

Further, the dynos, the air pressure of the tires, the way the car is strapped down all impact the results. The dyno will show a ball park for power and that's it. +/- 10% is pretty reasonable across two different dynos, all else equal...

Where they are useful tools is back to back tuning with an operator who knows how to deal with the heat variables as the car heats up on the rollers... where they are not useful is everything else....

That said, the OP is asking a question without a good answer. There are just too many variables, especially with boosted applications, and one of the HUGE variables is IAT... a cousin to IATs is the tuning, which is a huge variable as well...

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post #14 of 17 (permalink) Old 12-05-2017, 08:43 AM
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For stock motor I wouldn't go higher than 285whp. It's been floated around here for years. Forgot what torque for stock tranny. That's also listed around here. I want to say 17X-18X wftlbs.

I'm about 260whp. Haven't dynoed since the last tune. Will do so during the last 2 weeks of the year. If I drop in a 3.1" pulley I should be pretty close to 285whp.

** save ~10 lbs gain 1 hp ** EQ: Y=(190*X) / (1984-X) where Y is (HP) and X is (lbs)

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post #15 of 17 (permalink) Old 12-05-2017, 08:52 AM
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Ive broke lots of trans at 160 ft lbs. But that was partly related to track conditions.
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post #16 of 17 (permalink) Old 12-05-2017, 09:23 AM
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Ive broke lots of trans at 160 ft lbs. But that was partly related to track conditions.
I want to say it was ~176 wtq. I don't think it would be 167.

** save ~10 lbs gain 1 hp ** EQ: Y=(190*X) / (1984-X) where Y is (HP) and X is (lbs)

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post #17 of 17 (permalink) Old 12-05-2017, 09:24 AM
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I ran my stock trans for about 6 events with 265 ft-lbs at the wheels and had no issues; when Fred rebuilt the trans with his beefy gearset, he said even my synchros looked excellent, and that trans had 80k miles on it. Driving style matters, a lot. I've been told my shifts are "soft" but I call them "deliberate"
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