2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
Sponsored by:

Compression Question

Thread Tools
 
Search this Thread
 
Old 10-19-04, 02:13 PM
  #1  
Rotary Enthusiast

Thread Starter
 
LookThatsMe's Avatar
 
Join Date: Apr 2004
Location: NJ
Posts: 841
Likes: 0
Received 0 Likes on 0 Posts
Question Compression Question

Ok i have a 87 rx7 N/A and i wanna turbo charge it... I know with like civics and **** that u have to get pistons to produce lower compression... neway i found a Greddy turbo upgrade http://www.overboost.com/obs/search....ch_button.y=11 also do you guys know if its the same compression and the turbo motor? cuz i dont wanna pay 2700 for a turbo kit and end up blow my **** up... neway if you guys wanan check some stuff out i think thats a good site... might be a bit expensive but nice parts
Old 10-19-04, 02:23 PM
  #2  
Lives on the Forum

 
WAYNE88N/A's Avatar
 
Join Date: Feb 2004
Location: Coldspring TX
Posts: 5,721
Likes: 0
Received 2 Likes on 2 Posts
If you want to remain in a "safe" zone, you just can't boost an NA rotor engine as much as the turbo rotors, due to the compression differences...
Old 10-19-04, 03:39 PM
  #3  
mmmtrbo.

 
CRXtoRX7's Avatar
 
Join Date: Aug 2002
Location: SF BAY AREA
Posts: 682
Likes: 0
Received 0 Likes on 0 Posts
realistically, you can sell your NA and add it to your 2700 to get a Turbo Rx7 that you don't have to worry about blowing up.
Old 10-19-04, 07:34 PM
  #4  
Lives on the Forum

 
RETed's Avatar
 
Join Date: Feb 2001
Location: n
Posts: 26,664
Likes: 0
Received 17 Likes on 16 Posts
If you don't want to blow **** up, don't waste your money.
The stock ECU is CRAP is trying to control something like this, and I don't think you can afford the $1,000 minimum + another $1,000 to get it install and tuned for an aftermarket EMS ECU.
Please folks, don't argue with me on the stock ECU - go find BDC.
You see, this **** gets expensive in a hurry.
And, no that GReddy turbo kit does not fit on your non-turbo FC.


-Ted
Old 10-19-04, 07:40 PM
  #5  
Senior Member

iTrader: (1)
 
Innovation's Avatar
 
Join Date: Aug 2004
Location: Winter Park, Florida
Posts: 668
Likes: 0
Received 1 Like on 1 Post
What ever happened to the English language?
Old 10-19-04, 07:44 PM
  #6  
Lives on the Forum

 
WAYNE88N/A's Avatar
 
Join Date: Feb 2004
Location: Coldspring TX
Posts: 5,721
Likes: 0
Received 2 Likes on 2 Posts
It's been compressed into 3-letter acronyms to save time, lol...
Old 10-19-04, 07:49 PM
  #7  
Senior Member

iTrader: (1)
 
Innovation's Avatar
 
Join Date: Aug 2004
Location: Winter Park, Florida
Posts: 668
Likes: 0
Received 1 Like on 1 Post
**** is a four letter word and wanna is a five letter word. And what the heck is Neway?
Old 10-19-04, 09:40 PM
  #8  
90 Turbo

 
amishboy's Avatar
 
Join Date: Jun 2004
Location: Cookeville TN
Posts: 272
Likes: 0
Received 0 Likes on 0 Posts
N E way anyway I guess it saves one letter LOL
Old 10-19-04, 10:52 PM
  #9  
Lets rock.

 
flamin-roids's Avatar
 
Join Date: Apr 2004
Location: SLC, Utah
Posts: 1,355
Likes: 0
Received 0 Likes on 0 Posts
Yes I wonder if you could run S5 TII rotors in a N/A block and turbo charge it. Has that been covered?
Old 10-20-04, 12:29 AM
  #10  
Lives on the Forum

 
RETed's Avatar
 
Join Date: Feb 2001
Location: n
Posts: 26,664
Likes: 0
Received 17 Likes on 16 Posts
Originally Posted by flamin-roids
Yes I wonder if you could run S5 TII rotors in a N/A block and turbo charge it. Has that been covered?
Sure, you basically just built your own Kouki FC turbo engine block with inferior internals.


-Ted
Old 10-20-04, 05:45 PM
  #11  
Rotary Enthusiast

Thread Starter
 
LookThatsMe's Avatar
 
Join Date: Apr 2004
Location: NJ
Posts: 841
Likes: 0
Received 0 Likes on 0 Posts
Question

alright thanks another thing i found a Motor on Ebay Cusco 92 turbo would that fit in my S4? or should i just get a Jdm Turbo II motor? i seen the Jdm for 900 w/ (motor, 5 speed tranny, ecu, harness and I think around 53000 Km thats like 30 something miles) and the Cusco is just the motor for 1500

Last edited by LookThatsMe; 10-20-04 at 05:50 PM.
Old 10-20-04, 06:01 PM
  #12  
No more 7 or 8

iTrader: (3)
 
speeddemon32's Avatar
 
Join Date: Jun 2004
Location: San Bernardino - So Cal
Posts: 841
Likes: 0
Received 0 Likes on 0 Posts
Turbo swaps have been covered in other post, but in my oppinion you really should just get another car that is already turboed. it is way more work and money then you are going to want to do/spend. as you have to convert the engine, wireing harness, computer, tranny, driveshaft, rear end, axles, ect...
Just try to find a Turbo II
I am not saying it cant be done, my best friend converted his N/A over to Turbo II but it was a lot of work.
Old 10-20-04, 06:08 PM
  #13  
No more 7 or 8

iTrader: (3)
 
speeddemon32's Avatar
 
Join Date: Jun 2004
Location: San Bernardino - So Cal
Posts: 841
Likes: 0
Received 0 Likes on 0 Posts
oh yeah, and to answer the original question.

86-88 N/A = 9.1:1
89-91 N/A = 9.7:1 (i belive)
86-88 Turbo = 8.5:1
89-91 Turbo = 9:1
Old 10-20-04, 10:42 PM
  #14  
Rotary Enthusiast

 
rs_1101's Avatar
 
Join Date: May 2004
Location: OC
Posts: 1,088
Likes: 0
Received 0 Likes on 0 Posts
whats the problem with turboing a s4 if the s5tII had the same compression!? i thought it was lower.
on a similar note, would 3mm seals be considered decent for prepping an s4 motor for turbo power?
Old 10-21-04, 03:30 AM
  #15  
Lets rock.

 
flamin-roids's Avatar
 
Join Date: Apr 2004
Location: SLC, Utah
Posts: 1,355
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by speeddemon32
oh yeah, and to answer the original question.

86-88 N/A = 9.1:1
89-91 N/A = 9.7:1 (i belive)
86-88 Turbo = 8.5:1
89-91 Turbo = 9:1
Close. The S5 N/A and S4 TII are right. The S4 N/A is 9.4:1 and the S5 TII is 9.0:1.
Old 10-21-04, 04:22 AM
  #16  
Keep Right Except to Pass

 
HeffBoost's Avatar
 
Join Date: Jan 2003
Location: Seattle
Posts: 984
Likes: 0
Received 1 Like on 1 Post
on a similar note, would 3mm seals be considered decent for prepping an s4 motor for turbo power?
Don't waste your money. It's just unnecessary in my opinion.

As far as turboing an NA, I see no problem. Just little issues like LIM clearance and such. Leaves it up to you to do the figuring instead of buying bolt-on stuff that's been working on the original turbo cars forever.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
_Tones_
Adaptronic Engine Mgmt - AUS
10
05-25-21 05:37 AM
ZacMan
Build Threads
4
09-19-15 09:20 PM
ZaqAtaq
New Member RX-7 Technical
2
09-05-15 08:57 PM
Nosferatu
2nd Generation Specific (1986-1992)
7
09-05-15 02:13 PM



Quick Reply: Compression Question



All times are GMT -5. The time now is 02:19 PM.