SR20 Automatic! Anyone else besides me?
SR20 Automatic! Anyone else besides me?
Just wondering if there is anyone else out there running a sr20 with a auto transmission? Is so, what year car, blk or red top, how much boost any problems with you transmission etc?
I remember there was one guy that owns pacific rim and he drove a s13 coupe w/ sr20det auto. He was in a magazine shoot long time ago. Whats your impression of the auto w/sr20? I know right now on this forum that there is a guy with an RB20 auto. In stock form he puts out 176whp @7psi. Thats 18% drivetrain loss on an auto. Usually autos have 25-30% drivetrain loss. A 5spd has 15% loss. So with an upgraded torque converter he will either have better drive train loss or be equal to a 5spd. I'm saving up to get the RB20. Since SRs are so over priced these days.
Its fine . It seems to be faster off the line if you don't floor it. I read somewhere that nissans pulls timing if you floor them off the line. I believe the wolf chip will fix that. I'm running 10-11 psi on the stock intercooler, with a 3inch dp/exh. I've heard the rb20 wasnt all that great. I don't know for sure though. Orginally I wanted an rb25det /auto. I wanted more tq with the auto transmission. My car pulls nice through 1st and 2nd gears it does fall off in drive. I think it needs a lower drive gear. It shifts out of 2nd at 65mph and shifts out of drive around 110mph. I'm kind of afraid to push the transmission any harder. I don't know what kind of power the transmission will hold.
I'm running a FLYIN Miata II turbo setup running 12 psi on a 92 automatic miata engine with a 99 5spd transmission/94 lsd diff/ACT clutch lightened flywheel, 2 1/2"dp/exh. Racing beat sways/Spring, KYB shocks,Strut bar. The best it ever ran was 13.6 in the 1/4mile. 0-60mph 5.2sec. I'm down about 15hp due to using an automatic engine. It has lower compression though. My car needs tuning. I'm using the Link.
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Hijacker
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'94 F-150 - Location: Fredericksburg, VA
used to be auto. it was switched over to manual before the engine was ever inserted into the car. the stock DP is mated to a 2.5" exhaust via a stock cat (i should change all that out sometime). I was running stock boost up until a few weeks ago when I put the HKS actuator on and now I run 11-12 PSI (all of my boost is measured after the intercooler, so i run higher boosts from the turbo).
As for the transmission, I don't know what happened to it. My friend who did all the swapping work before I bought the car from him probably ditched the transmission. I haven't seen it at his house, so I'm assuming he either sold it on eBay or ditched it at a salvage yard.
As for the transmission, I don't know what happened to it. My friend who did all the swapping work before I bought the car from him probably ditched the transmission. I haven't seen it at his house, so I'm assuming he either sold it on eBay or ditched it at a salvage yard.
I have an auto SR20 too. Bone stock for now, just a Starion IC and 260Z radiator. I've had it in my S13 for about a year and a half now. It runs sweet especially after you disconnect the resistor (next to drivers side strut tower) that allows the transmission to shift faster and harder. This is a line pressure control in the transmission. When disconnected the only drawback was that you feel it engage kinda hard, from 1st to 2nd, when you start driving from a stand still or cruising over a speed bump. This feels like it may damage the transmission but I've heard that it doesn't. However, I recently engineered a solution to this problem by using a pressure switch to activate a relay. Below 3psi my transmission is connected to the resistor, like stock, and after 3psi the pressure switch activates relay which opens the circuit that the resistor goes through. Simple, yet effective.
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DriftNsmokn
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My girlfriend has an auto SR20 blacktop, it's bone stock with little upgrades such as the intercooler (Type S, HKS), HKS turbo piping and HKS airflow. Its not having any problems. It runs GREAT! Nice and smooth, transmission shifts smoothly and efficiently..of course gas isn't all that great..but who cares =P Other than that we've had no problems, we're running a 2 1/2 piping from the turbo back..it runs great. It didn't pass visual but did okay on smog.
Surfpac. We've got to hook up. I live in Davie but pretty much stay in Hollywood at my friends house tinkering on cars. I would like to check out your car and see how the res. trick works. Do you ever go to tower shoppes on friday nights? I unhooked the resistor on my car while it had the ka engine. It seemed to shift harder at lower load levels than at WOT. The problem I had was 90% of the time it would throw a check engine light. If you started the car with the resistor unpluged it would do this everytime. I added a toggle switch and cut one of the wires to the resistor and ran it to the toggle. I would just flick the switch when I wanted it shift firmer. My car shifts pretty firm already.First to Second is good. I haven't tried this setup on my SR yet. It's good to know I have some company out there. 
What kind of mileage are you getting? Mines kinda hard on gas. The most I've ever seen is 18mpg around town. I get mostly 15-17mpg. My Ka would get 20mpg.
What kind of mileage are you getting? Mines kinda hard on gas. The most I've ever seen is 18mpg around town. I get mostly 15-17mpg. My Ka would get 20mpg.DriftNsmokn, What kind of mileage does your girlfriend car get? Do you know how much boost she's running? Mine was running around 8psi after It was installed with a 3in exhaust. I turned it up to 10psi and it felt worlds different. I think my waste gate bleeds off too much. At 8psi it didnt spool up as fast as it should have. Now at 10psi its totally different. I have a problem with boost spike at shift points. It spikes then drops down to 8-9psi and then respools. This sux but I have got used to it. How about her car? Mine seems to be running rich, the back of my car stays blk. I hate that. I look like a ricer. Is she running a auto ka rad or sr? I have a Koyo rad with a aftermarket transmission cooler stuck in the passenger side foglight area. I removed the foglights and have ducted both the tc and the smic.
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DriftNsmokn
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Spins She's running the RS Yama Motors radiator, R33 transmission oil coolant, however it just recently got out of the shop so it's running at 8psi. But's it's running great! I mean we don't have the problem with it running rich. It's a 96 blacktop with the J5 ECU...had a MINES ecu..but it turned out her engine was to new, so it wouldn't work. Mileage..unfortuanetly..is well..not that great...hahaha...it's nothing compared to the KA. I think her car is running about 18 or so mpg. I never actually sat and looked, I check that one out and let you know. What kind of sr do you have..which ecu are you running? If you've had everything checked out in terms of the wiring, it may be your ecu, the japanese sometimes tune them without us knowing. Also, when did your swap, did you leave the auto KA wiring or JDM wiring? We're using the US one.
there is a guy in australia running an s15 auto with a big turbo etc he ran a 13.5 not bad for a var with a bad take off.you cna get your auto kitted if you ahve an auto shop thats used to doing nissan boxes that should help for some aussies are running modified c 4's and have sr's runing 10's etc cheersmeggala
DriftNsmokn, My sr is a 95 Blktop. I don't remember what ecu I'm running. I have it wrote down somewhere. I know it's written in red. I looked it up on a site and it appeared to be the correct ecu for the engine year. I had a friend of a friend do the install. He had never attemped this install before. He had wiring problems to say the least. I'm not running the ka wiring harness. I found out after the install that I need to keep the ka harness to make the ac system work like stock. I sold the ka engine/harness etc. to the installer. I want to turn up the boost to 12psi get a SAFC 2 and have it put on a dyno and tuned with a Wideband 02. Do you happen to know anything about the SR's auto trannys? Such as what kind of power they will hold? I want to replace the transmission filter. I don't know if the ka one is the same. I've found a company in which to order unusual parts from japan. I had to order a auto TPS and a Wiper amp for my car. No one hear in the US could help.
yeah there are a few places but the cost is high what you need to find is some one familiar with jatco boxes there should be some one in hte us the z32 would be similar although smaller. or possibly even the maxima boxes.cost here to get one done with converter etc around $3-3500 aus you supply the box so your talking big banana's, most fot he peopel wont ship to the US. ask around locally first is your best bet your auto shops if they know their stuff should beable to do it.cheers
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DriftNsmokn
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Spins,No problem we can hook up one day and I'll show you the Resistor mod than I did using the pressure switch. By the way, Level 10 specializes in modifying automatic transmissions by offering valve body upgrades, torque converters and electronic device that allows you to shgift it like a tiptronic transmission. Expensive but very very effective. Ask any Supra or 300ZX guys that are running auto trannies, they swear by automatic in drag racing. http://www.levelten.com/store/index.htm
Do any of you have a problem with your auto transmission upshifting early if your spinning your tires. I didn't notice this problem before I installed a new tps. But I really wasn't pealing out or kicking it sideways in turns. If I spin the tires hard it will upshift from 1st to 2nd at around 4500rpms. If it's spinning slightly it will upshift around 6000rpms. It normally upshifts at 6500-6700rpms at WOT.