Torque drop in mid-range

[kyle'87]

I have recently had my car mapped and the mapper mentioned that in the mid range of my rpm he is seeing a torque drop. He said it started at around 30lbs but managed to map it out to around 10lbs but said it was still there.

I have done some reading and what I am currently looking at is the Spoon 4-2 2-1 section causing this. It is suggested that top end the Spoon performs great (it is a race part after all) but mid-range it doesn't perform so well. I'm thinking the Spoon just isn't flowing well enough mid-range for daily driving.

I'm currently debating with replacing the 4-2 > 2-1 section with the Tegiwa 4-2-1 to see if this helps.

Car is also booked in with TGM at the end of the month just to make sure it isn't something else.

Has anyone had similar experiences?

 

[kyle'87]

After more research I've answer my own question.

Looks like I will be replacing the Spoon 4-2 2-1 sections with either the Tegiwa 4-2-1 or the Buddy Club Racing Header to gain some mid-range torque.

 

[tricker_luke]

I was in the exact same position. I ended up swapping out the 4-2 and 2-1 for a buddyclub manifold and gained about 30lb torque mid range. I lost maybe 5 or 10 hp from the top end but the mid range was a massive improvement!

 

[kyle'87]

I was in the exact same position. I ended up swapping out the 4-2 and 2-1 for a buddyclub manifold and gained about 30lb torque mid range. I lost maybe 5 or 10 hp from the top end but the mid range was a massive improvement!

That is good to know! I think i stumbled onto one of your previous posts when researching which got me digging. Did you have the full Spoon system, including the B pipe and the N1, how was the fit to the BC header?

 

[tricker_luke]

Yes it was the full system and I probably had posted about it!

I have the Spoon backbox and centre pipe now, fitment is fine but the pipe does hang a bit low. I found that you can push up on the pipe when tightening to give a bit more clearance but I get over 'most' speedbumps ok or with a slight scrape.

 

[kyle'87]

Yes it was the full system and I probably had posted about it!

I have the Spoon backbox and centre pipe now, fitment is fine but the pipe does hang a bit low. I found that you can push up on the pipe when tightening to give a bit more clearance but I get over 'most' speedbumps ok or with a slight scrape.

Thanks for the info Luke!