matty

been 7 yrs since i was stock ecu but if i recall i used to boost 12psi on the stock ecu.

jacobcartmill

iTrader: (6)

https://www.rx7club.com/forum/showpo...6&postcount=46

i dont know how credible that guy is, and the post is 5 years old, but i've heard that before -that you can overboost for under a second before the fuel gets cut by the ECU

and this is from the same thread:
https://www.rx7club.com/forum/showpo...1&postcount=17

matty

this is like fd 101....surprised i cant remember. pretty sure u are wrong though.

jacobcartmill

iTrader: (6)

i could be, but I'M pretty sure my boost gauge isnt reading incorrectly, in which case none of this fuel cut stuff would even matter

matty

agreed

Sr20fd3st

officially fuel cut happens at 12 psi. if your gauge is showing you that it's cutting at 10.5 psi then your gauge might be readying 10 psi when it's really at 11.5 or so. mines off about 2 psi and about 4 or 6 on vacuum. it's a piece of **** pettit autometer.

and what did you do to drop the weight that much that's a significant reduction. is it an R1 or touring or base ?

jacobcartmill

iTrader: (6)

i havent done anything to drop weight except remove the spare tire.

its a 93 base model

Sr20fd3st

aw my touring packs on another couple hundred pounds at least. booo

matty

whats ur car weigh again


also i dont think its 12 psi either on stock ecu. keep going higher.......

94tkt

pettit said that the stock fuel cut comes on at 14.8 psi but it doesnt mean that you can run it that high. just get an wideband and keep a eye on it if i goes over 11.5 then i would shut down. alot of things factor in on AFR. temperature and altitude will change it alot. that is why tuners tune the ratio low so if it is hot that day then it wont be affected when it is cold.

jacobcartmill

iTrader: (6)

thanks for that tuning tip.
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oh yeah, BTW, did i mention the car is running 10psi?

94tkt

yea i read that. also to add.. AFR on a dyno is not as accurate either because the exhaust cools as it moves to the tip. right in the down pipe is the best

also how do you like non sequential? and when are you seeing full boost at?

jacobcartmill

iTrader: (6)

it's also reading AFTER the cat in my case


i did the full non-sequential mod and in 4th gear i get full boost around 3500rpms

Sr20fd3st

eh i always heard 12psi but i also always thought that was wrong. when i forst got my car it had just a downpipe and was spiking to 15 without cutting. but later it did cut at around 12, which was lame. but w/e

t-von

iTrader: (8)

Well that explains the weight. Hell base models are the lightest ones.

vr fd 4sale

i just got back from the track i ran 13.0@ 105 1.9 60ft mods: pf cat back,k&N drop in, short shifter

djseven

iTrader: (56)

You sure it has the stock downpipe?? I didnt realize a catback would make that kind of difference.

Sr20fd3st

no kidding. a downpipe would benefit more than a catback anyway it seems

Juiced

I have some Racing Hart C2 18x8.5 front and 18x9.5 rear for sale $1000 3-piece rims in good shape off my 93 rx-7. I also have my stock twins for sale that are coming off next week for my single turbo upgrade $500 work perfect! You can email me at flyassgator@yahoo.com

jacobcartmill

iTrader: (6)

nice post.
also, your sig says the fronts are 7.5", not 8.5

vr fd 4sale

yes, it is the stock downpipe. i hope to get a downpipe this week and head back to the track anyone have one for sale

matty

what power difference?

people get 13.5 all the time on a completely stock car. the mph seems inline to me as well. maybe slightly high. so i dotn know what the hell u are taking about.

Trout2

iTrader: (5)

Boost cut happens much higher and is not a set pressure, it varies with RPM. I ran 12-11-12 psi on stock ECU with DP, CB, M2 CAI, Underdrive Pulley, and MBC for a couple years (stock IC and Cat).

Jack