You can see how much larger the ID of the downpipes is compared to stock.
The headers bolted right in and there was plenty of clearance around things making the install easier.
The Z1 downpipes were bolted to the headers.
The Z1 Motorsports headers and downpipes bolted to the Tomei exhaust that was already on the car.
The Z1 Motorsports downpipes have this extension for the rear O2 sensors which reduces the chance of a check engine light coming on.
Since we were going to be running E85 as a fuel, we needed to upgrade our injectors. We selected Deatschwerks 750cc/min injectors part number 17U-06-0750-6. We like Deatschwerks because they have a competitive price and are sold as matched sets with characterization data for each set, this helps the tuner when getting them to run with your particular application.
15 comments
Yaaaasssssss!! Loving these updates!! Since IAT’s are so susceptible to heatsoak in this car, do you think moving the mafs or possible running a different IAT sensor just after those filters would be beneficial?
No, not with the ability to tune the ECU.
interesting. so with uprev/ecutek etc. you can disregard the scaling or just tune to not pull so much timing?
you can change the MAF tables.
Long time listener, first time caller 😉
Surprised you didnt go for long tube headers since you are ditching the cats anyway? Well documented power and SOUND improvements to be had there. Also those intakes are very long, no detriment to power having the inlet tract so long?
We know long tube headers are better for power production, but that’s not what the car owner wanted. He wanted to be able to put the cats back for street use.
Street use, but un-sprung hub. What a mashup! You mention un-spung hub being better for synchros. Why do you figure that?
I guess it’s because the disc, which is still connected to the input shaft via splines is lighter and can change rotational speed easier with less inertia. Got it.
Lighter and less inertia.
Did you guys notice a lot more NVH from the gearbox with the unsprung centre?
I did a CD009 conversion on my SR20 and initially had an unsprung twin plate. Due to the relatively large backlash in the gearbox the off acceleration chattering of the gears was insanely loud. Changed to a sprung centre and majority of the noise was gone.
I know about the noise because my twin disk solid hub clutch on my Z is awful in this regard. In this case it isnt so bad.
oh…
Did you notch the bumper beam, and then box it back in? It looks like it, or Howard is just darn pure magic. It wasn’t called out in the article.
Yes it was…and Howard is most definitely the man!
thanks for the reply Mike cheers