Exige S240 dyno... what do you think? - LotusTalk

usurbrain · 10-07-2008, 05:58 PM

So BlackTrax ran 4 pulls for me. These are the charts for the second pull (intercooler was very heat soaked), and the 4th pull (intercooler was sprayed with water before the run). The most it made was 205.4 hp and 156.6 ft lbs. A/F was ~12.5. Outside temp was ~74 degrees.

Car is completely stock. Are these numbers low for a Dynapack dyno? CharlieX what do you think?

HP & Torque charts

A/F Ratios

milehitom · 10-07-2008, 06:34 PM

That seems about right...a 15% loss from bhp to whp (the average estimated loss) would be 36hp.

Tom

Noel · 10-07-2008, 06:38 PM

Food for thought - Managing intercooler temperatures is the most important power related modification.

No matter how much power you make from X amount of mods added, once the air-to-air intercooler stops to function at an optimum scenario. The ECU will kick in and start to retard ignition timings, which ultimately relate to loss of power.

Bavarian Motorist · 10-07-2008, 07:30 PM

That's not bad. Peak HP is not high, but peak torque is excellent, and that's really what matters.

Murix · 10-07-2008, 07:41 PM

It's just me, and I have never seen a previous dyno for an Exige S 240, but I would have expected another 5-10hp to the wheels. What does the Exige S220 put down?

Thomasio · 10-07-2008, 07:49 PM

The stock intercooler heat soaks like that. Amazing, isn't it...

Mr. Know · 10-07-2008, 09:00 PM

Quote:

Originally Posted by Thomasio

The stock intercooler heat soaks like that. Amazing, isn't it...

On a dyno after multiple runs...I'd be shocked if it didn't!

Vishus_1 · 10-07-2008, 09:21 PM

Quote:

Originally Posted by Murix

It's just me, and I have never seen a previous dyno for an Exige S 240, but I would have expected another 5-10hp to the wheels. What does the Exige S220 put down?

Good question...if I recall correctly, the 2007 S looks just like this and they were rated at 220 hp. Could the speculation on this board be correct, that the 240 really isn't any different than the 07 S? Can someone debunk this?

Casey · 10-07-2008, 09:38 PM

Here is a dyno from A 240S.....you are local....you should come by and we could test your car against this 240S

Casey · 10-07-2008, 09:40 PM

Here is a dyno from a 220S.....the blue line is the stock dyno numbers

shay2nak · 10-07-2008, 09:47 PM

whenever I dyno my car, I'll let it sit for like 30 mintues for the engine to cool down.

usurbrain · 10-07-2008, 09:56 PM

if you do that, then it has to warm up again to operating temp before it runs normal. I believe that if you run it cold, it won't run with the second cam. I think, I may be wrong.... I remember in my 05 elise, it wouldn't switch to the second cam till it warmed up.

Vishus_1 · 10-07-2008, 11:04 PM

Casey --- thank you for the examples...

A couple of questions

1. Is the 220S in the dyno comparison above a 2007 with the same intercooler and supercharger as the 08 240S or is this the 2008 non-intercooled 220S that has a different supercharger?

2. If this comparison is between a 2007 S and a 2008 240S that has the same supercharger and intercooler - what is creating the difference (200 vs 227hp and 147 vs 157 tq)? Is it simply ECU mapping or is there more - ie injectors?

Bavarian Motorist · 10-07-2008, 11:26 PM

Quote:

Originally Posted by usurbrain

if you do that, then it has to warm up again to operating temp before it runs normal. I believe that if you run it cold, it won't run with the second cam. I think, I may be wrong.... I remember in my 05 elise, it wouldn't switch to the second cam till it warmed up.

It shouldn't take very long to warm up after just 30 min and the dyno operators will warm it up at low RPM before they do another run.

Mr. Know · 10-08-2008, 01:45 AM

Ya, absolutely your water temp needs to be above 180+ to remove the limiter, but you also don't want to run back to back pulls and hope for good results. Did you ventilate the engine compartment AND the intercooler? Basically the intercooler does nothing at all (and can experience heat soak and ECU will retart timing) on a dyno unless it has external air flow.

Illumiloti · 10-08-2008, 02:23 AM

Quote:

Originally Posted by Mr. Know

Ya, absolutely your water temp needs to be above 180+ to remove the limiter

Isn't it 158 degree's when the rev limiter switches off?

usurbrain · 10-08-2008, 07:22 AM

Temp was above 180, and the intercooler was cooled with a water spray before the last run. There was a large fan in front of the car, but probably didn't move enough air to make a huge difference.... right after the 4th run, the intercooler was HOT! What I'm wondering about is the dip in power at 6k rpm, and a flat spot between 6-7k whereas Casey's dyno just goes straight up smoothly....

Quote:

Originally Posted by Mr. Know

Ya, absolutely your water temp needs to be above 180+ to remove the limiter, but you also don't want to run back to back pulls and hope for good results. Did you ventilate the engine compartment AND the intercooler? Basically the intercooler does nothing at all (and can experience heat soak and ECU will retart timing) on a dyno unless it has external air flow.

Mr. Know · 10-08-2008, 08:43 AM

Quote:

Originally Posted by Pestodude

Isn't it 158 degree's when the rev limiter switches off?

I'm fairly certain that its incrimental, and 158 is the starting point. I remember reading something about the rev limiter being removed, however the ECU still retards timing until higher temps are reached. Someone who's more knowledgeable will probably correct me.

Quote:

Originally Posted by usurbrain

Temp was above 180, and the intercooler was cooled with a water spray before the last run. There was a large fan in front of the car, but probably didn't move enough air to make a huge difference.... right after the 4th run, the intercooler was HOT! What I'm wondering about is the dip in power at 6k rpm, and a flat spot between 6-7k whereas Casey's dyno just goes straight up smoothly....

My uneducated guess is you are experiencing heat soak and timing retardation...even after "cooling" the intercooler with water before the run. Dynoing a car with a mid engine design and an intercooler needs special considerations.

FLuXeXigeS · 10-08-2008, 09:54 AM

Quote:

Originally Posted by Vishus_1

Casey --- thank you for the examples...

A couple of questions

1. Is the 220S in the dyno comparison above a 2007 with the same intercooler and supercharger as the 08 240S or is this the 2008 non-intercooled 220S that has a different supercharger?

2. If this comparison is between a 2007 S and a 2008 240S that has the same supercharger and intercooler - what is creating the difference (200 vs 227hp and 147 vs 157 tq)? Is it simply ECU mapping or is there more - ie injectors?

+1

S240 = 240crankHP - 227 = 13HPloss
S220 = 220crankHP - 200 = 20HPloss
:?:

Casey · 10-08-2008, 09:56 AM

The 220 was an 07 and the 240 was an 08

10-07-2008, 05:58 PM	#1 (permalink)
usurbrain Registered User Join Date: Aug 2005 Location: Sunnyvale, CA Posts: 313	Exige S240 dyno... what do you think? So BlackTrax ran 4 pulls for me. These are the charts for the second pull (intercooler was very heat soaked), and the 4th pull (intercooler was sprayed with water before the run). The most it made was 205.4 hp and 156.6 ft lbs. A/F was ~12.5. Outside temp was ~74 degrees. Car is completely stock. Are these numbers low for a Dynapack dyno? CharlieX what do you think? HP & Torque charts A/F Ratios

10-07-2008, 07:30 PM	#4 (permalink)
Bavarian Motorist Live to Drive Join Date: Nov 2006 Location: NYC/Westchester, NY Posts: 10,852	That's not bad. Peak HP is not high, but peak torque is excellent, and that's really what matters. __________________ Be an alpha male. Drive a Lotus.

10-07-2008, 07:49 PM	#6 (permalink)
Thomasio really light stuff Join Date: Jul 2003 Posts: 3,503	The stock intercooler heat soaks like that. Amazing, isn't it... __________________ 07 SY Exige S Really Light Stuff Intercooler . RLS Tubes . RLS Water/Methanol Injection . RLS 3.0" Pulley . RLS Wing Plates . RLS CF Window Panel

10-07-2008, 09:47 PM	#11 (permalink)
shay2nak I <3 chicken, I <3 liver Join Date: Dec 2003 Location: Land of da 1000 Oaks, CA Posts: 15,045	whenever I dyno my car, I'll let it sit for like 30 mintues for the engine to cool down. __________________ save ~10 lbs gain 1 hp EQ: Y=(190X) / (1984-X) where Y is (HP) and X is (lbs) '07 EXIGE S * MY CAR ** VIDEOS! '08 ACURA TSX 6-speed http://www.makeNYNYagain.com

10-08-2008, 01:45 AM	#15 (permalink)
Mr. Know British by extrapolation Join Date: Jun 2007 Location: Marin, California Posts: 3,350 Images: 6	Ya, absolutely your water temp needs to be above 180+ to remove the limiter, but you also don't want to run back to back pulls and hope for good results. Did you ventilate the engine compartment AND the intercooler? Basically the intercooler does nothing at all (and can experience heat soak and ECU will retart timing) on a dyno unless it has external air flow. __________________ 07 Magnetic Blue Exige S Join the Blue Lotus Team on Facebook.

10-07-2008, 06:34 PM	#2 (permalink)
milehitom Registered User Join Date: Oct 2005 Location: Denver, CO Posts: 3,143	That seems about right...a 15% loss from bhp to whp (the average estimated loss) would be 36hp. Tom

10-07-2008, 06:38 PM	#3 (permalink)
Noel Exige Cup 255 Join Date: Apr 2007 Location: 33.87°S 151.21°E Car: ロータス MKII エキシージ Type: Komo-Tec S300 Posts: 326	Food for thought - Managing intercooler temperatures is the most important power related modification. No matter how much power you make from X amount of mods added, once the air-to-air intercooler stops to function at an optimum scenario. The ECU will kick in and start to retard ignition timings, which ultimately relate to loss of power.

10-07-2008, 07:41 PM	#5 (permalink)
Murix Rotary Refugee Join Date: May 2007 Location: Santa Monica Posts: 996 Images: 3	It's just me, and I have never seen a previous dyno for an Exige S 240, but I would have expected another 5-10hp to the wheels. What does the Exige S220 put down?

10-07-2008, 09:38 PM	#9 (permalink)
Casey Registered User Join Date: Aug 2005 Posts: 555	Here is a dyno from A 240S.....you are local....you should come by and we could test your car against this 240S

10-07-2008, 09:40 PM	#10 (permalink)
Casey Registered User Join Date: Aug 2005 Posts: 555	Here is a dyno from a 220S.....the blue line is the stock dyno numbers

10-07-2008, 09:56 PM	#12 (permalink)
usurbrain Registered User Join Date: Aug 2005 Location: Sunnyvale, CA Posts: 313	if you do that, then it has to warm up again to operating temp before it runs normal. I believe that if you run it cold, it won't run with the second cam. I think, I may be wrong.... I remember in my 05 elise, it wouldn't switch to the second cam till it warmed up.

10-07-2008, 11:04 PM	#13 (permalink)
Vishus_1 Super charged! Join Date: Dec 2006 Location: Missouri Posts: 1,038 Images: 62	Casey --- thank you for the examples... A couple of questions 1. Is the 220S in the dyno comparison above a 2007 with the same intercooler and supercharger as the 08 240S or is this the 2008 non-intercooled 220S that has a different supercharger? 2. If this comparison is between a 2007 S and a 2008 240S that has the same supercharger and intercooler - what is creating the difference (200 vs 227hp and 147 vs 157 tq)? Is it simply ECU mapping or is there more - ie injectors?

10-08-2008, 09:56 AM	#20 (permalink)
Casey Registered User Join Date: Aug 2005 Posts: 555	The 220 was an 07 and the 240 was an 08

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