OEM Throttle Body vs EPS Tuning

NissanZ34

A guy was selling his EPS Tuning 70mm throttle bodies because his tuner said it was easier to tune. That being said, he also mentioned he was going forced induction. I wonder if it's a good aftermarket part investment or I will eventually have to sell it for the same reason?

projectpanda

I have the EPS throttle bodies and it takes a tuner who tunes them alot to work out all the kinks. I still have rev hang and its a bit annoying.

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RHM 75mm TB & ported up/low mani., 3" intakes/velocity stack, Z1 Headers, Motordyne ART pipes, HBP 3.5" exhaust, Tein MonoSport, SPL F/R arms, endlinks, and tie rods , Eibach sways, Z1 rotors F/R, diff bush., subframe collar, Bell Raceworks diff brace

Spooler

If you are going FI, it is a waste of money. Save your money, you will need it.

Whjaxn17

They hang and their customer service over the issue is standoff-ish at best. Took them off within a couple weeks and haven't looked back. There are cars making well into the 8xxwhp range or more on stock TBs. No sense in dealing with that @$$hole over a small enough gain it could simply be considered a margin of error on the dyno.

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377whp/299wtq NA
704whp/519wtq, SOHO stage 2.5
IG: pearlywhite.z

SG4247

I have the EPS 70mm and I like them.

My car was already tuned, and so I just bolted them on, and performed the idle relearn with my laptop and EcuTek. No functional issues at all, and no re-tuning required in my case.

SG

NissanZ34

The general consensus is the horsepower gains from the EPS throttle bodies on a naturally aspirated application is negligible considering the drawbacks of extra hassle to get them dialed in and a not so good drivability.

All in all, the 70mm TB are not a good investment for one like myself who wants to stay N/A, for now.

If somebody still wants to change their OEM throttle bodies for EPS, they should expect tuning issues and possibly reliability too.