Rtek 1.7 review and more
#26
Eat, sleep, work, mod.
Thread Starter
Join Date: Jun 2001
Location: Long Island
Posts: 2,517
Likes: 0
Received 0 Likes
on
0 Posts
I bet your hesitation isn't at all related to the injector size. I highly doubt the 4% flow difference will cause your hesitation, it doesn't seem drastic enough. Clean/add grounds first - might save some $.
#27
Originally Posted by jon88se
I bet your hesitation isn't at all related to the injector size. I highly doubt the 4% flow difference will cause your hesitation, it doesn't seem drastic enough. Clean/add grounds first - might save some $.
#28
Senior Member
Join Date: Aug 2004
Location: Albuquerque, New Mexico
Posts: 504
Likes: 0
Received 0 Likes
on
0 Posts
Thanks guys
Originally Posted by jon88se
I bet your hesitation isn't at all related to the injector size. I highly doubt the 4% flow difference will cause your hesitation, it doesn't seem drastic enough. Clean/add grounds first - might save some $.
FYI - The remaining concern is another guy at the same tuner shop in ABQ, NM with a 87 TII got the v1.7 Rtek chip and then installed 750cc secondaries and has the same problem, 3200-3300 RPM hesitation.
#29
Army Strong...or somethin
iTrader: (3)
Join Date: Jan 2004
Location: Green Bay, WI
Posts: 857
Likes: 0
Received 0 Likes
on
0 Posts
i just sent my ECU out today!!! u guys got me itching to get it back already!!!!
btw, how long did u guys end up waiting for ur chip to get back to u from the day u sent it out?? i cant wait!!! although ill prolly have it before i get the car rolling anyway lol
btw, how long did u guys end up waiting for ur chip to get back to u from the day u sent it out?? i cant wait!!! although ill prolly have it before i get the car rolling anyway lol
#32
Senior Member
Join Date: Aug 2004
Location: Albuquerque, New Mexico
Posts: 504
Likes: 0
Received 0 Likes
on
0 Posts
Update and progress on grounding and injector size
Originally Posted by Chuckles
jon88se and guys - I was looking for someone to tell me that the injectors weren't the problem. I am going to do the full blown grounding process, OEM and additional w/o changing the secondaries. Think you are right about the grounds as I had this before the Rtek 1.7 I'll report back progress and results..Thanks again.........chuckles
FYI - The remaining concern is another guy at the same tuner shop in ABQ, NM with a 87 TII got the v1.7 Rtek chip and then installed 750cc secondaries and has the same problem, 3200-3300 RPM hesitation.
FYI - The remaining concern is another guy at the same tuner shop in ABQ, NM with a 87 TII got the v1.7 Rtek chip and then installed 750cc secondaries and has the same problem, 3200-3300 RPM hesitation.
Alright I promised to give an update. RotaryRX's Tommy and I built ground wires from #4 heavy insulated wire that I bought at Driver's Den, great stereo place in ABQ, NM. Put eyelet connectors on and soldered solid with propane torch (only way to go). Followed Rotary Resurrection's guide to Grounding, but didn't do the Hot wire installs. (Q: I haven't read that anyone else did the new hot leads from that guide. Should I?) Just did the grounds. Hesitation was milder throughout and almost non-existent from 1st to 2nd. Still felt and smelled like it was loading up with fuel when the 750cc secondaries came on. (Note: read another post in this thread that said he grounded the boost sensor to the firewall and hesitation was gone. So will build this ground also.
Bought some 720cc injectors off eBay and sold the 750s here on the forum. Hesitation is still the same, but the rich gas smell is gone! This led us to start thinking about what else could be causing the hesitation and why the 750s ran so rich even though as jon88se stated there was only an ~4% increase in fuel flow.
Check out the logic in this theory and tear it apart if flawed! My 10AE came stock from CA, sea level, without any hesitation or running rich. Albuquerque is close to 5k feet above sea level. Add 720 or 750 secondaries and you have less air and more fuel. That equals Rich status to me. Tommy's brother has a 87 TII that is streetported. He did the Rytek v1.7 and added the RC Eng. 750cc secondaries with hardly a hesitation at all. The streetport adds more air to offset the extra fuel. Guys in ABQ who buy or moved from Texas are having similar problems with hesitation and rich conditions. Do you think the streetport compensates for the difference in altitude and air? Or are we airheads and full of ****?
#34
Full Member
Join Date: May 2004
Location: Little rock
Posts: 192
Likes: 0
Received 0 Likes
on
0 Posts
Race teams change fuel setup acording to local, alt., day/night...etc. so I could see how a change in alt could affect the a/f ratios to an extent. To what extent I don't know though.
#35
Senior Member
Join Date: Aug 2004
Location: Albuquerque, New Mexico
Posts: 504
Likes: 0
Received 0 Likes
on
0 Posts
Fuel Rail Pressure?
Originally Posted by Evil Aviator
Check your fuel rail pressure.
Please educate me as I see you're online. This is kicking my *** and I'm tired of throwing money at it........thx, chuckles
Last edited by Chuckles; 01-22-05 at 02:13 AM. Reason: specific
#36
Army Strong...or somethin
iTrader: (3)
Join Date: Jan 2004
Location: Green Bay, WI
Posts: 857
Likes: 0
Received 0 Likes
on
0 Posts
i got my rtek a couple days ago!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! but it s stitting in my room still waitin on some warm weather and a couple more parts before i throw it all together!
#37
Rotorhead
Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
Posts: 9,136
Likes: 0
Received 39 Likes
on
33 Posts
Originally Posted by Chuckles
Hey Eveeeeeel-We added a good aftermarket fuel pressure regulator and gauge. It is holding a steady ~40-45 PSI. Is this what you are referring or is there another procedure to actually test the new custom machined fuel rails we installed (w/o Fuel Pulsation Damper or whatever you call the "thingy" (an ABQ term) that burns RX-7s up)?
Please educate me as I see you're online. This is kicking my *** and I'm tired of throwing money at it........thx, chuckles
Please educate me as I see you're online. This is kicking my *** and I'm tired of throwing money at it........thx, chuckles
Yes, the removal of the pulsation damper could cause problems.
#38
Senior Member
Join Date: Aug 2004
Location: Albuquerque, New Mexico
Posts: 504
Likes: 0
Received 0 Likes
on
0 Posts
FPR and PD
Originally Posted by Evil Aviator
Sometimes higher altitudes take their toll on a fuel system. Did you check your fuel pressure while driving during the conditions that produce the problem, or just at idle?
Yes, the removal of the pulsation damper could cause problems.
Yes, the removal of the pulsation damper could cause problems.
Seriously, the PD removal could be contributing to the hesitation problem. I don't understand.
I also have a new Walbro 255, but didn't put it in, because of the steady high fuel pressure. Didn't think I needed it.
#39
Rotorhead
Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
Posts: 9,136
Likes: 0
Received 39 Likes
on
33 Posts
Originally Posted by Chuckles
Only checked it at idle as we placed the gauge inside the engine compartment by the oil dipstick away from alot of heat. Should have thought about putting handrails on the fender to hold on and monitor the gauge while someone pulls 7k RPM, LOL! It would be like wind-flying on a 7! Right up your alley, isn't it?
Can you attach a hose between the gauge and its fitting so that you can temporarily mount the gauge outside the hood while driving? Or maybe one of your friends has a hand gauge that you could attach between some existing fittings?
Originally Posted by Chuckles
Seriously, the PD removal could be contributing to the hesitation problem. I don't understand.
BTW, there is always a pressure figure associated with the volume flow rating of a fuel injector. For example, 720cc @ 45psi. This means that "720cc" injectors may or may not be comparable to "750cc" injectors, depending on the pressure at which each is rated. This also means that if the fuel rail pressure is higher than the fuel injector pressure rating, it is flowing more cc at 100% duty cycle than it is rated. Conversely, a lower fuel rail pressure will cause the injectors to flow a lower amount than rated.
Originally Posted by Chuckles
I also have a new Walbro 255, but didn't put it in, because of the steady high fuel pressure. Didn't think I needed it.
Thread
Thread Starter
Forum
Replies
Last Post