Dyno Comparison For Each Part Added
 

We have a customer that is the original owner of a completely stock 95 MB PEP. He brought the car to us to sort out a few things earlier this year, major issue being the OE cardboard LIM gasket was blown, producing crappy idle and no power since it was a huge boost leak.

Fixed all the gasket with the new OE metal version and installed an ACT HD SS clutch, Koyo radiator, AST and installed an HKS downpipe. All power restored plus a few extra.

Our customer decided that it was time for some more power and better handling, so I decided it would be a great opportunity to document the HP gains (or not) of common bolt on modifications.

Unfortunately I did not dyno the car with the stock precat, slipping clutch and boost leaks.

As the car sits with the current mods, really only the HKS downpipe as far as HP adders the car made 254rwhp/222tq

https://cimg8.ibsrv.net/gimg/www.rx7...a3661c4298.jpg

https://cimg5.ibsrv.net/gimg/www.rx7...1d9626e065.jpg

https://cimg4.ibsrv.net/gimg/www.rx7...2931d61973.jpg

The car is currently here for Apexi catback, Apexi intake, SMIC, PFC and HKS Twin Power. Along with some HKS coilovers.

I will install the catback and throw it on the dyno to see how it compares to the stock catback. Then install the Intake, then the PFC, then the SMIC or HKS TP. Stay tuned.

In for updates on this! Thanks for taking the time to do this.

Matt

Subbed!

Now these are the types of threads I really love.

Nice! Surprised how much power it made with just the DP.
IIRC stock FD's dyno ~220whp?

I have a completely stock 93 BB in the shop that has the stock precat,might throw that on the dyno for a baseline.

Cool in for results

That caught my eye as well.

I've been fortunate enough over the years to both drive and own quite a few low-mile stock original engine original twin turbo cars and they always ran surprisingly strong, if taken care of and not tinkered with. As Mazda built these cars back in the early to mid 90's they did run very strong with a great power band, although man a stock car is quiet :)

Glad to see you doing this Chris, will be interesting to see some results :icon_tup:

Not a big surprise at all, had a car in the shop with 37K miles installed a HKS DP, stock everything else, car made 255rwhp

https://cimg3.ibsrv.net/gimg/www.rx7...0fb38b947a.jpg

Awesome, can't wait to see the updates

This should be very interesting. Thanks for taking the time to do this.

I'm really interested to see the gains per mod as well. Glad you guys have the opportunity to do this and are taking the time to share it with us.

Subbed

Thanks for taking the time to do this. It will be neat to see what difference the parts make.

Vince

Glad you guys are doing this. Subscribed.

Subbed as well. Awesome info.

We are adding the Apexi N1 Dual first. Here is the side by side comparison. Decided to weigh the catbacks also. Stock weighed in at 31lbs, Apexi at 26lbs.

https://cimg2.ibsrv.net/gimg/www.rx7...7b4ccfa191.jpg

https://cimg6.ibsrv.net/gimg/www.rx7...1bebf28f4a.jpg

https://cimg8.ibsrv.net/gimg/www.rx7...9e876e566c.jpg

https://cimg4.ibsrv.net/gimg/www.rx7...e010dd6928.jpg

I recently put my OEM catback on, amazing how quiet it is.

Subscribing. Thanks for documenting this!

Just did a pull with the Apexi N1 Dual installed, keep in mind this still has a stock main cat and stock ECU, I can do no tuning at all at this point. Results were still impressive. Here is the dyno run and a comparison overlay of HKS downpipe only. Car made 264rwhp/241tq so it picked up 14hp & 19 tq, more importantly the increases were across the entire rpm range. There was a small increase in boost after transition, but overall the boost remained the same. It also completely eliminated the dip in HP at 5500rpm that was evident on both the HKS DP only dyno sheets.

https://cimg3.ibsrv.net/gimg/www.rx7...ff47942018.jpg

https://cimg5.ibsrv.net/gimg/www.rx7...6c29aa695f.jpg

Up next will be the Apexi Intake. APEXi Intake (93+ RX-7)

Interesting to see the "boost spiking" rendering on the dyno from bolt ons.
What are the boost control plans for this vehicle?

Great power gains from a couple common mods. Already a different animal, I'm sure.
TotY nom.

Apexi intake installed and the results were also impressive. The car made 276rwhp/254tq, so it picked up 8hp/13tq, more importantly again it was through the entire rpm range and not just peak power. We will be able to address the small spike tomorrow, when the PFC is installed and I will be able to actually start tuning the car. I will show the differences in power from the stock PFC map and a map that is tuned specifically for the car. The peak torque reading will actually be lower, since the spike after transition is providing peak reading that is not consistent with the overall. Eliminate the spike and the peak torque will be closer to 225

https://cimg1.ibsrv.net/gimg/www.rx7...35525d4f84.jpg

https://cimg3.ibsrv.net/gimg/www.rx7...9c30169dbc.jpg

https://cimg0.ibsrv.net/gimg/www.rx7...2b6f53f5af.jpg

8HP increase and the main source of air is coming from the radiator. Wonder what a cold air intake system would do :D