Same WHP but more Torque? How?
 

Apologies I’ve had a few rookie questions this week. I have an Edelbrock SC installed for about a month now and things are going well. I’m just curious how my tuner got 246whp and 220ft/lbs when the advertisement for Edelbrock is 242whp and 186ft/lbs (near stock tq). How can you get that much more tq while keeping the whp at the advertised amount from Edelbrock?

My concern is my transmission in the future, so I’m not sure if I should see about getting torque lowered? I know the stock transmission is only rated for 250nm (184ft/lbs).

Dyno:

https://i.imgur.com/chlUiou.jpg

Tune it for lower peak torque at higher engine speed. Modest boost only up top. It's how I would do it.

I shift at 4-5k. So they would have to lower it a lot around there. Is 220ft/lbs something to be concerned about? I know it’s a crap shoot with FI.

I honestly don't know. The weak link is fourth gear so, even NA, I try not to lean into it too much there. I would keep the stock clutch and let that be the safety. If it slips, too much torque for the transmission.

All dyno's read different. Don't read too much into it. As long as you aren't slamming 4th gear all day long you'll be fine.

Wait... what about that point at 7000 RPM?... Where everything fades? Weightless...


5K is like sex with a condom.

Hahaha

7k when I’m depressed and nostalgic on the backroads :burnrubber:

Which tuner did you use? You can do a few things, if time and money are not a limitation.
1. Flash an edelbrock carb tune and try to dyno the car on the same dyno and see if it makes a difference.
2. Assuming the car has a low octane tune in one of the modes, run the car in that
3. Get one of the popular ones like Zach , CSG or William at Delicious to tune for you.
4. Ask the question to Edelbrock itself by sending the dyno chart and see what they say about the tune and their R&D about transmission

PS: Edelbrock quote power and torque at the wheels . Is yours the same or at the crank as there is about 15% transmission losses from crank to wheel?
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If you have a 2017+ manual transmission twin, they all have the 4.3 final drive diffs (manual only) which give you more torque at the wheels. The lower torque numbers must be with a 4.1 final drive

This is really interesting. I may just contact Edelbrock and see what they have to say. The tune is a local custom tune and very good (best I’ve had). These numbers are using a hub dyno (Dynapack) so it should be at the wheels but without the power loss from the wheels on a roller

Horsepower = Torque x RPM / 5,252

So 246hp at approx 7k rpm is 185lb ft.

Also, dynapacks read high

You can have them play with fuelling and timing to reduce torque down low. I would bring it up with your tuner and see if they can flatten the already pretty flat torque curve if you're super concerned.

This is really helpful, thank you. I’ll let it be for now and just monitor the situation. I’m amazed tq is where it is at. It seems like 220ftlbs is around 300whp for what I’ve seen but I’m at 246whp


@Irace86.2.0 You were putting down decent power on the smaller pulley with your Harrop (and it's up for sale - anyone?). Did you have and transmission problems with your TQ? I know you hooned a bit around town.

I don’t know what other modifications you have besides the supercharger. Do you have a header or anything?

This is Edelbrock’s CARB tune, right? They provide a single tune, right?

https://www.limitlessmotorsports.ca/...it-stage-1.jpg

Here is a custom tune making around 210tq.

https://www.delicioustuning.com/site...?itok=1Rbshg6S



You aren’t seeing a higher horsepower because there was drop off at the top, and he didn’t rev it out to 7500rpms; he stopped at 7000rpms. Was he seeing knock? Was he at the end of fueling? Was it a hot day, or had the engine reached heat soak? Was he just being conservative? I don’t know. Ask him why it tapers off so much at the top. Seems like he got more torque down low.

I was on E85 at 14.5psi, which is around 275wtq. I didn’t hard launch too often, nor did I downshift two gears too often, but there was plenty of hard driving. The transmission can take more than stock torque. You can break the transmission on stock torque too.

With a k24 turbo in the works, I’ll be testing the stock transmissions limits. We will see what happens.

I am going down a rabbit hole with differing dyno readings on TQ. The logic makes sense on this post from NASIOC

My TQ is mostly likely much lower when you factor in wheel weight and resistance, as I was dyno'd on a hub Dynapack. That makes me feel better.